Update signalr-reference-data-plane-rest-api.md

Author: vicancy

articles/azure-signalr/signalr-reference-data-plane-rest-api.md

@@ -5,7 +5,7 @@ author: vicancy
 ms.author: lianwei
 ms.service: signalr
 ms.topic: reference
-ms.date: 03/29/2023
+ms.date: 08/02/2024
 ---
 
 # Azure SignalR Service data-plane REST API reference
@@ -103,6 +103,8 @@ Similar to authenticating via `AccessKey`, a [JWT](https://en.wikipedia.org/wiki
 
 The difference is that in this scenario, Microsoft Entra ID generates the JWT. For more information, see [Learn how to generate Microsoft Entra tokens](../active-directory/develop/reference-v2-libraries.md).
 
+The credential scope used should be `https://signalr.azure.com/.default`.
+
 You can also use *role-based access control (RBAC)* to authorize the request from your client or server to Azure SignalR Service. For more information, see [Authorize access with Microsoft Entra ID for Azure SignalR Service](./signalr-concept-authorize-azure-active-directory.md).
 
 ### User-related REST API