diff --git a/jsign-crypto/src/main/java/net/jsign/jca/AzureTrustedSigningService.java b/jsign-crypto/src/main/java/net/jsign/jca/AzureTrustedSigningService.java
index ca7c46ee..18549132 100644
--- a/jsign-crypto/src/main/java/net/jsign/jca/AzureTrustedSigningService.java
+++ b/jsign-crypto/src/main/java/net/jsign/jca/AzureTrustedSigningService.java
@@ -30,6 +30,7 @@
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 
 import net.jsign.DigestAlgorithm;
@@ -41,6 +42,10 @@
  */
 public class AzureTrustedSigningService implements SigningService {
 
+    // Dataplane documentation for 2023-06-15-preview:
+    // https://github.com/Azure/azure-rest-api-specs/blob/main/specification/trustedsigning/data-plane/TrustedSigning/preview/2023-06-15-preview/azure.developer.trustedsigning.json
+    private static final String API_VERSION = "2023-06-15-preview";
+
     /** Cache of certificate chains indexed by alias */
     private final Map<String, Certificate[]> certificates = new HashMap<>();
 
@@ -144,42 +149,140 @@ private SignStatus sign(String account, String profile, String algorithm, byte[]
         request.put("signatureAlgorithm", algorithm);
         request.put("digest", Base64.getEncoder().encodeToString(data));
 
-        Map<String, ?> response = client.post("/codesigningaccounts/" + account + "/certificateprofiles/" + profile + "/sign?api-version=2022-06-15-preview", JsonWriter.format(request));
+        RESTClient.RESTResponse initialResponse = client.postResponse("/codesigningaccounts/" + account + "/certificateprofiles/" + profile + ":sign?api-version=" + API_VERSION, JsonWriter.format(request));
 
-        String operationId = (String) response.get("operationId");
+        Map<String, ?> statusResponse = initialResponse.getBody();
+        String operationLocation = initialResponse.getHeader("operation-location");
+        String operationId = readOperationId(statusResponse);
+        if (operationId == null) {
+            operationId = extractOperationId(operationLocation);
+        }
 
-        // poll until the operation is completed
-        long startTime = System.currentTimeMillis();
-        int i = 0;
-        while (System.currentTimeMillis() - startTime < timeout * 1000) {
-            try {
-                Thread.sleep(Math.min(1000, 50 + 10 * i++));
-            } catch (InterruptedException e) {
-                break;
-            }
-            response = client.get("/codesigningaccounts/" + account + "/certificateprofiles/" + profile + "/sign/" + operationId + "?api-version=2022-06-15-preview");
-            String status = (String) response.get("status");
-            if ("InProgress".equals(status)) {
-                continue;
+        String status = statusResponse != null ? (String) statusResponse.get("status") : null;
+
+        if (!isSucceeded(status)) {
+            String statusResource = resolveStatusResource(account, profile, operationId, operationLocation);
+
+            long startTime = System.currentTimeMillis();
+            int i = 0;
+            while (System.currentTimeMillis() - startTime < timeout * 1000) {
+                try {
+                    Thread.sleep(Math.min(1000, 50 + 10 * i++));
+                } catch (InterruptedException e) {
+                    break;
+                }
+                statusResponse = client.get(statusResource);
+                status = statusResponse != null ? (String) statusResponse.get("status") : null;
+                if (operationId == null) {
+                    operationId = readOperationId(statusResponse);
+                }
+                if (isPending(status)) {
+                    continue;
+                }
+                if (isSucceeded(status)) {
+                    break;
+                }
+
+                throw new IOException("Signing operation " + describeOperation(operationId) + " failed: " + status);
             }
-            if ("Succeeded".equals(status)) {
-                break;
+
+            if (!isSucceeded(status)) {
+                throw new IOException("Signing operation " + describeOperation(operationId) + " timed out");
             }
+        }
+
+        SignStatus signStatus = buildSignStatus(statusResponse);
+        if (signStatus == null) {
+            throw new IOException("Signing operation " + describeOperation(operationId) + " returned no result");
+        }
+
+        return signStatus;
+    }
 
-            throw new IOException("Signing operation " + operationId + " failed: " + status);
+    private SignStatus buildSignStatus(Map<String, ?> response) {
+        if (response == null) {
+            return null;
         }
 
-        if (!"Succeeded".equals(response.get("status"))) {
-            throw new IOException("Signing operation " + operationId + " timed out");
+        Map<String, ?> result = response;
+        Object resultNode = response.get("result");
+        if (resultNode instanceof Map) {
+            result = (Map<String, ?>) resultNode;
         }
 
-        SignStatus status = new SignStatus();
-        status.signature = Base64.getDecoder().decode((String) response.get("signature"));
-        status.signingCertificate = new String(Base64.getDecoder().decode((String) response.get("signingCertificate")));
+        Object signatureValue = result.get("signature");
+        Object certificateValue = result.get("signingCertificate");
+        if (!(signatureValue instanceof String) || !(certificateValue instanceof String)) {
+            return null;
+        }
 
+        SignStatus status = new SignStatus();
+        status.signature = Base64.getDecoder().decode((String) signatureValue);
+        status.signingCertificate = new String(Base64.getDecoder().decode((String) certificateValue));
         return status;
     }
 
+    private String resolveStatusResource(String account, String profile, String operationId, String operationLocation) throws IOException {
+        if (operationLocation != null && !operationLocation.isEmpty()) {
+            return ensureApiVersion(operationLocation.trim());
+        }
+        if (operationId != null && !operationId.isEmpty()) {
+            return "/codesigningaccounts/" + account + "/certificateprofiles/" + profile + "/sign/" + operationId + "?api-version=" + API_VERSION;
+        }
+        throw new IOException("Signing operation identifier not returned by Azure Trusted Signing");
+    }
+
+    private String ensureApiVersion(String resource) {
+        if (resource == null || resource.isEmpty() || resource.contains("api-version=")) {
+            return resource;
+        }
+        return resource + (resource.contains("?") ? "&" : "?") + "api-version=" + API_VERSION;
+    }
+
+    private String extractOperationId(String operationLocation) {
+        if (operationLocation == null || operationLocation.isEmpty()) {
+            return null;
+        }
+        String value = operationLocation;
+        int queryIndex = value.indexOf('?');
+        if (queryIndex >= 0) {
+            value = value.substring(0, queryIndex);
+        }
+        int slashIndex = value.lastIndexOf('/');
+        if (slashIndex >= 0 && slashIndex < value.length() - 1) {
+            return value.substring(slashIndex + 1);
+        }
+        return null;
+    }
+
+    private String readOperationId(Map<String, ?> response) {
+        if (response == null) {
+            return null;
+        }
+        Object value = response.get("operationId");
+        if (value == null) {
+            value = response.get("id");
+        }
+        return value instanceof String ? (String) value : null;
+    }
+
+    private boolean isPending(String status) {
+        String normalized = normalizeStatus(status);
+        return normalized == null || "INPROGRESS".equals(normalized) || "RUNNING".equals(normalized) || "NOTSTARTED".equals(normalized);
+    }
+
+    private boolean isSucceeded(String status) {
+        return "SUCCEEDED".equals(normalizeStatus(status));
+    }
+
+    private String normalizeStatus(String status) {
+        return status == null ? null : status.replaceAll("\\s+", "").toUpperCase(Locale.ROOT);
+    }
+
+    private String describeOperation(String operationId) {
+        return operationId != null ? operationId : "unknown";
+    }
+
     private static class SignStatus {
         public byte[] signature;
         public String signingCertificate;
diff --git a/jsign-crypto/src/main/java/net/jsign/jca/RESTClient.java b/jsign-crypto/src/main/java/net/jsign/jca/RESTClient.java
index a3d5cb8f..39d59f2d 100644
--- a/jsign-crypto/src/main/java/net/jsign/jca/RESTClient.java
+++ b/jsign-crypto/src/main/java/net/jsign/jca/RESTClient.java
@@ -17,10 +17,12 @@
 package net.jsign.jca;
 
 import java.io.IOException;
+import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.net.URLEncoder;
 import java.nio.charset.StandardCharsets;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -70,6 +72,10 @@ public RESTClient errorHandler(Function<Map<String, ?>, String> errorHandler) {
         return query("GET", resource, null, null);
     }
 
+    public RESTResponse getResponse(String resource) throws IOException {
+        return request("GET", resource, null, null);
+    }
+
     public Map<String, ?> post(String resource, String body) throws IOException {
         return query("POST", resource, body, null);
     }
@@ -78,6 +84,14 @@ public RESTClient errorHandler(Function<Map<String, ?>, String> errorHandler) {
         return query("POST", resource, body, headers);
     }
 
+    public RESTResponse postResponse(String resource, String body) throws IOException {
+        return request("POST", resource, body, null);
+    }
+
+    public RESTResponse postResponse(String resource, String body, Map<String, String> headers) throws IOException {
+        return request("POST", resource, body, headers);
+    }
+
     public Map<String, ?> post(String resource, Map<String, String> params) throws IOException {
         return post(resource, params, false);
     }
@@ -124,6 +138,10 @@ public RESTClient errorHandler(Function<Map<String, ?>, String> errorHandler) {
     }
 
     private Map<String, ?> query(String method, String resource, String body, Map<String, String> headers) throws IOException {
+        return request(method, resource, body, headers).getBody();
+    }
+
+    private RESTResponse request(String method, String resource, String body, Map<String, String> headers) throws IOException {
         URL url = new URL(resource.startsWith("http") ? resource : endpoint + resource);
         log.finest(method + " " + url);
         HttpURLConnection conn = (HttpURLConnection) url.openConnection();
@@ -167,20 +185,26 @@ public RESTClient errorHandler(Function<Map<String, ?>, String> errorHandler) {
         log.finest("Content-Type: " + contentType);
 
         if (responseCode < 400) {
-            byte[] binaryResponse = IOUtils.toByteArray(conn.getInputStream());
+            InputStream input = conn.getInputStream();
+            byte[] binaryResponse = input != null ? IOUtils.toByteArray(input) : new byte[0];
             String response = new String(binaryResponse, StandardCharsets.UTF_8);
             log.finest("Content-Length: " + binaryResponse.length);
             log.finest("Content:\n" + response);
             log.finest("");
 
-            Object value = JsonReader.jsonToJava(response);
-            if (value instanceof Map) {
-                return (Map) value;
-            } else {
-                Map<String, Object> map = new HashMap<>();
-                map.put("result", value);
-                return map;
+            Map<String, ?> responseBody = Collections.emptyMap();
+            if (!response.trim().isEmpty()) {
+                Object value = JsonReader.jsonToJava(response);
+                if (value instanceof Map) {
+                    responseBody = (Map) value;
+                } else {
+                    Map<String, Object> map = new HashMap<>();
+                    map.put("result", value);
+                    responseBody = map;
+                }
             }
+
+            return new RESTResponse(responseCode, conn.getHeaderFields(), responseBody, binaryResponse);
         } else {
             String error = conn.getErrorStream() != null ? IOUtils.toString(conn.getErrorStream(), StandardCharsets.UTF_8) : "";
             if (conn.getErrorStream() != null) {
@@ -193,4 +217,47 @@ public RESTClient errorHandler(Function<Map<String, ?>, String> errorHandler) {
             }
         }
     }
+
+    static class RESTResponse {
+        private final int statusCode;
+        private final Map<String, List<String>> headers;
+        private final Map<String, ?> body;
+        private final byte[] rawBody;
+
+        RESTResponse(int statusCode, Map<String, List<String>> headers, Map<String, ?> body, byte[] rawBody) {
+            this.statusCode = statusCode;
+            this.headers = headers != null ? headers : Collections.emptyMap();
+            this.body = body != null ? body : Collections.emptyMap();
+            this.rawBody = rawBody != null ? rawBody : new byte[0];
+        }
+
+        public int getStatusCode() {
+            return statusCode;
+        }
+
+        public Map<String, List<String>> getHeaders() {
+            return headers;
+        }
+
+        public Map<String, ?> getBody() {
+            return body;
+        }
+
+        public byte[] getRawBody() {
+            return rawBody;
+        }
+
+        public String getHeader(String name) {
+            if (name == null) {
+                return null;
+            }
+            for (Map.Entry<String, List<String>> entry : headers.entrySet()) {
+                if (entry.getKey() != null && entry.getKey().equalsIgnoreCase(name)) {
+                    List<String> values = entry.getValue();
+                    return values != null && !values.isEmpty() ? values.get(0) : null;
+                }
+            }
+            return null;
+        }
+    }
 }
diff --git a/jsign-crypto/src/test/java/net/jsign/jca/AzureTrustedSigningServiceTest.java b/jsign-crypto/src/test/java/net/jsign/jca/AzureTrustedSigningServiceTest.java
index 676150ed..1a5d29a6 100644
--- a/jsign-crypto/src/test/java/net/jsign/jca/AzureTrustedSigningServiceTest.java
+++ b/jsign-crypto/src/test/java/net/jsign/jca/AzureTrustedSigningServiceTest.java
@@ -16,14 +16,19 @@
 
 package net.jsign.jca;
 
-import java.io.FileReader;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.security.GeneralSecurityException;
 import java.security.KeyStoreException;
 import java.security.cert.Certificate;
 import java.security.cert.X509Certificate;
 import java.util.Collections;
+import java.util.LinkedHashMap;
 import java.util.List;
+import java.util.Map;
 
+import com.cedarsoftware.util.io.JsonReader;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
@@ -55,15 +60,16 @@ public void testGetAliases() throws Exception {
     public void testGetCertificateChain() throws Exception {
         onRequest()
                 .havingMethodEqualTo("POST")
-                .havingPathEqualTo("/codesigningaccounts/MyAccount/certificateprofiles/MyProfile/sign")
-                .havingQueryStringEqualTo("api-version=2022-06-15-preview")
+        .havingPathEqualTo("/codesigningaccounts/MyAccount/certificateprofiles/MyProfile:sign")
+        .havingQueryStringEqualTo("api-version=2023-06-15-preview")
                 .respond()
                 .withStatus(202)
-                .withBody("{\"operationId\":\"1f234bd9-16cf-4283-9ee6-a460d31207bb\",\"status\":\"InProgress\",\"signature\":null,\"signingCertificate\":null}");
+        .withHeader("operation-location", "http://localhost:" + port() + "/codesigningaccounts/MyAccount/certificateprofiles/MyProfile/sign/1f234bd9-16cf-4283-9ee6-a460d31207bb?api-version=2023-06-15-preview")
+        .withBody("{\"operationId\":\"1f234bd9-16cf-4283-9ee6-a460d31207bb\",\"status\":\"InProgress\",\"signature\":null,\"signingCertificate\":null}");
         onRequest()
                 .havingMethodEqualTo("GET")
                 .havingPathEqualTo("/codesigningaccounts/MyAccount/certificateprofiles/MyProfile/sign/1f234bd9-16cf-4283-9ee6-a460d31207bb")
-                .havingQueryStringEqualTo("api-version=2022-06-15-preview")
+        .havingQueryStringEqualTo("api-version=2023-06-15-preview")
                 .respond()
                 .withStatus(200)
                 .withBody("{\"operationId\":\"1f234bd9-16cf-4283-9ee6-a460d31207bb\",\"status\":\"InProgress\",\"signature\":null,\"signingCertificate\":null}")
@@ -72,7 +78,7 @@ public void testGetCertificateChain() throws Exception {
                 .withBody("{\"operationId\":\"1f234bd9-16cf-4283-9ee6-a460d31207bb\",\"status\":\"InProgress\",\"signature\":null,\"signingCertificate\":null}")
                 .thenRespond()
                 .withStatus(200)
-                .withBody(new FileReader("target/test-classes/services/trustedsigning-sign.json"));
+                .withBody(loadSignSuccessResponse());
 
         SigningService service = new AzureTrustedSigningService("http://localhost:" + port(), "token");
         Certificate[] chain = service.getCertificateChain("MyAccount/MyProfile");
@@ -88,8 +94,8 @@ public void testGetCertificateChain() throws Exception {
     public void testGetCertificateChainWithError() {
         onRequest()
                 .havingMethodEqualTo("POST")
-                .havingPathEqualTo("/codesigningaccounts/MyAccount/certificateprofiles/MyProfile/sign")
-                .havingQueryStringEqualTo("api-version=2022-06-15-preview")
+        .havingPathEqualTo("/codesigningaccounts/MyAccount/certificateprofiles/MyProfile:sign")
+        .havingQueryStringEqualTo("api-version=2023-06-15-preview")
                 .respond()
                 .withStatus(403);
 
@@ -112,15 +118,16 @@ public void testGetPrivateKey() throws Exception {
     public void testSign() throws Exception {
         onRequest()
                 .havingMethodEqualTo("POST")
-                .havingPathEqualTo("/codesigningaccounts/MyAccount/certificateprofiles/MyProfile/sign")
-                .havingQueryStringEqualTo("api-version=2022-06-15-preview")
+                .havingPathEqualTo("/codesigningaccounts/MyAccount/certificateprofiles/MyProfile:sign")
+                .havingQueryStringEqualTo("api-version=2023-06-15-preview")
                 .respond()
                 .withStatus(202)
+                .withHeader("operation-location", "http://localhost:" + port() + "/codesigningaccounts/MyAccount/certificateprofiles/MyProfile/sign/1f234bd9-16cf-4283-9ee6-a460d31207bb?api-version=2023-06-15-preview")
                 .withBody("{\"operationId\":\"1f234bd9-16cf-4283-9ee6-a460d31207bb\",\"status\":\"InProgress\",\"signature\":null,\"signingCertificate\":null}");
         onRequest()
                 .havingMethodEqualTo("GET")
                 .havingPathEqualTo("/codesigningaccounts/MyAccount/certificateprofiles/MyProfile/sign/1f234bd9-16cf-4283-9ee6-a460d31207bb")
-                .havingQueryStringEqualTo("api-version=2022-06-15-preview")
+                .havingQueryStringEqualTo("api-version=2023-06-15-preview")
                 .respond()
                 .withStatus(200)
                 .withBody("{\"operationId\":\"1f234bd9-16cf-4283-9ee6-a460d31207bb\",\"status\":\"InProgress\",\"signature\":null,\"signingCertificate\":null}")
@@ -129,7 +136,7 @@ public void testSign() throws Exception {
                 .withBody("{\"operationId\":\"1f234bd9-16cf-4283-9ee6-a460d31207bb\",\"status\":\"InProgress\",\"signature\":null,\"signingCertificate\":null}")
                 .thenRespond()
                 .withStatus(200)
-                .withBody(new FileReader("target/test-classes/services/trustedsigning-sign.json"));
+                .withBody(loadSignSuccessResponse());
 
         AzureTrustedSigningService service = new AzureTrustedSigningService("http://localhost:" + port(), "token");
         SigningServicePrivateKey privateKey = service.getPrivateKey("MyAccount/MyProfile", null);
@@ -144,15 +151,16 @@ public void testSign() throws Exception {
     public void testSignWithTimeout() throws Exception {
         onRequest()
                 .havingMethodEqualTo("POST")
-                .havingPathEqualTo("/codesigningaccounts/MyAccount/certificateprofiles/MyProfile/sign")
-                .havingQueryStringEqualTo("api-version=2022-06-15-preview")
+                .havingPathEqualTo("/codesigningaccounts/MyAccount/certificateprofiles/MyProfile:sign")
+                .havingQueryStringEqualTo("api-version=2023-06-15-preview")
                 .respond()
                 .withStatus(202)
+                .withHeader("operation-location", "http://localhost:" + port() + "/codesigningaccounts/MyAccount/certificateprofiles/MyProfile/sign/1f234bd9-16cf-4283-9ee6-a460d31207bb?api-version=2023-06-15-preview")
                 .withBody("{\"operationId\":\"1f234bd9-16cf-4283-9ee6-a460d31207bb\",\"status\":\"InProgress\",\"signature\":null,\"signingCertificate\":null}");
         onRequest()
                 .havingMethodEqualTo("GET")
                 .havingPathEqualTo("/codesigningaccounts/MyAccount/certificateprofiles/MyProfile/sign/1f234bd9-16cf-4283-9ee6-a460d31207bb")
-                .havingQueryStringEqualTo("api-version=2022-06-15-preview")
+                .havingQueryStringEqualTo("api-version=2023-06-15-preview")
                 .respond()
                 .withStatus(200)
                 .withBody("{\"operationId\":\"1f234bd9-16cf-4283-9ee6-a460d31207bb\",\"status\":\"InProgress\",\"signature\":null,\"signingCertificate\":null}");
@@ -169,15 +177,16 @@ public void testSignWithTimeout() throws Exception {
     public void testSignWithFailure() throws Exception {
         onRequest()
                 .havingMethodEqualTo("POST")
-                .havingPathEqualTo("/codesigningaccounts/MyAccount/certificateprofiles/MyProfile/sign")
-                .havingQueryStringEqualTo("api-version=2022-06-15-preview")
+                .havingPathEqualTo("/codesigningaccounts/MyAccount/certificateprofiles/MyProfile:sign")
+                .havingQueryStringEqualTo("api-version=2023-06-15-preview")
                 .respond()
                 .withStatus(202)
+                .withHeader("operation-location", "http://localhost:" + port() + "/codesigningaccounts/MyAccount/certificateprofiles/MyProfile/sign/1f234bd9-16cf-4283-9ee6-a460d31207bb?api-version=2023-06-15-preview")
                 .withBody("{\"operationId\":\"1f234bd9-16cf-4283-9ee6-a460d31207bb\",\"status\":\"InProgress\",\"signature\":null,\"signingCertificate\":null}");
         onRequest()
                 .havingMethodEqualTo("GET")
                 .havingPathEqualTo("/codesigningaccounts/MyAccount/certificateprofiles/MyProfile/sign/1f234bd9-16cf-4283-9ee6-a460d31207bb")
-                .havingQueryStringEqualTo("api-version=2022-06-15-preview")
+                .havingQueryStringEqualTo("api-version=2023-06-15-preview")
                 .respond()
                 .withStatus(200)
                 .withBody("{\"operationId\":\"1f234bd9-16cf-4283-9ee6-a460d31207bb\",\"status\":\"Failed\",\"signature\":null,\"signingCertificate\":null}");
@@ -202,8 +211,8 @@ public void testSignWithInvalidAlgorithm() throws Exception {
     public void testSignWithAuthorizationError() throws Exception {
         onRequest()
                 .havingMethodEqualTo("POST")
-                .havingPathEqualTo("/codesigningaccounts/MyAccount/certificateprofiles/MyProfile/sign")
-                .havingQueryStringEqualTo("api-version=2022-06-15-preview")
+                .havingPathEqualTo("/codesigningaccounts/MyAccount/certificateprofiles/MyProfile:sign")
+                .havingQueryStringEqualTo("api-version=2023-06-15-preview")
                 .respond()
                 .withStatus(404)
                 .withContentType("application/json")
@@ -215,4 +224,17 @@ public void testSignWithAuthorizationError() throws Exception {
         Exception e = assertThrows(GeneralSecurityException.class, () -> service.sign(privateKey, "SHA256withRSA", "Hello".getBytes()));
         assertEquals("message", "InternalError - Response status code does not indicate success: 403 (Forbidden).", e.getCause().getMessage());
     }
+
+        private String loadSignSuccessResponse() throws Exception {
+                String json = new String(Files.readAllBytes(Paths.get("target/test-classes/services/trustedsigning-sign.json")), StandardCharsets.UTF_8);
+                Map<String, Object> response = (Map<String, Object>) JsonReader.jsonToJava(json);
+                Map<String, Object> payload = new LinkedHashMap<>();
+                payload.put("operationId", response.get("operationId"));
+                payload.put("status", response.get("status"));
+                Map<String, Object> result = new LinkedHashMap<>();
+                result.put("signature", response.get("signature"));
+                result.put("signingCertificate", response.get("signingCertificate"));
+                payload.put("result", result);
+                return JsonWriter.format(payload);
+        }
 }