Merge pull request #219255 from Clare-Zheng82/1122-Update_Azure_function_doc

Update Azure Function linked service section

Author: prmerger-automator[bot]

articles/data-factory/control-flow-azure-function-activity.md

@@ -9,7 +9,7 @@ ms.service: data-factory
 ms.subservice: orchestration
 ms.custom: synapse
 ms.topic: conceptual
-ms.date: 09/01/2022
+ms.date: 11/23/2022
 
 ---
 
@@ -47,7 +47,11 @@ Function Key provides secure access to function name with each one having separa
 | Type             | The type property must be set to: **AzureFunction**          | Yes          |
 | Function app url | URL for the Azure Function App. Format is `https://<accountname>.azurewebsites.net`. This URL is the value under **URL** section when viewing your Function App in the Azure portal | Yes          |
 | Function key     | Access key for the Azure Function. Click on the **Manage** section for the respective function, and copy either the **Function Key** or the **Host key**. Find out more here: [Azure Functions HTTP triggers and bindings](../azure-functions/functions-bindings-http-webhook-trigger.md#authorization-keys) | Yes          |
-| Authentication   | The authentication method used for calling the Azure Function. The supported values are 'System-assigned managed identity' or 'anonymous'. | Yes          |
+| Authentication   | The authentication method used for calling the Azure Function. The supported values are 'System-assigned managed identity' or 'anonymous'.| Yes          |
+| Resource ID  | The App (client) ID of the Azure Function. Switch to **Authentication** section for the respective function, and get the App (client) ID under **Identity provider**. This property will be displayed when you use system-assigned managed identity. For more information, see [Configure your App Service or Azure Functions app to use Azure AD login](../app-service/configure-authentication-provider-aad.md).| No         |
+
+>[!Note]
+> When you use anonymous authentication, ensure that you have taken down your identity on the Azure Function side.
 
 ## Azure Function activity