diff --git a/sdk/appconfiguration/azure-data-appconfiguration/src/main/java/com/azure/data/appconfiguration/credentials/ConfigurationClientCredentials.java b/sdk/appconfiguration/azure-data-appconfiguration/src/main/java/com/azure/data/appconfiguration/credentials/ConfigurationClientCredentials.java
index eb94c806a724..bb4b15a3ab36 100644
--- a/sdk/appconfiguration/azure-data-appconfiguration/src/main/java/com/azure/data/appconfiguration/credentials/ConfigurationClientCredentials.java
+++ b/sdk/appconfiguration/azure-data-appconfiguration/src/main/java/com/azure/data/appconfiguration/credentials/ConfigurationClientCredentials.java
@@ -103,7 +103,7 @@ public Mono<Map<String, String>> getAuthorizationHeadersAsync(URL url, String ht
 
     private static class AuthorizationHeaderProvider {
         private final String signedHeadersValue = String.join(";", SIGNED_HEADERS);
-        private static final String HMAC_SHA256 = "HMAC-SHA256 Credential=%s, SignedHeaders=%s, Signature=%s";
+        private static final String HMAC_SHA256 = "HMAC-SHA256 Credential=%s&SignedHeaders=%s&Signature=%s";
         private final CredentialInformation credentials;
         private final Mac sha256HMAC;