Merge pull request #202267 from kengaderdus/derdues-patch-3

[Azure AD B2C] Update app registration procedure for client credentials flow

Author: PRMerger15

articles/active-directory-b2c/client-credentials-grant-flow.md

@@ -9,7 +9,7 @@ manager: CelesteDG
 ms.service: active-directory
 ms.workload: identity
 ms.topic: how-to
-ms.date: 06/15/2022
+ms.date: 06/21/2022
 ms.custom: project-no-code
 ms.author: kengaderdus
 ms.subservice: B2C
@@ -82,7 +82,17 @@ can't contain spaces. The following example demonstrates two app roles, read and
 
 ## Step 2. Register an application
 
-To enable your app to sign in with Azure AD B2C using client credentials flow, register your applications (**App 1**). To create the web API app registration, follow these steps:
+To enable your app to sign in with Azure AD B2C using client credentials flow, you can use an existing application or register a new one (**App 1**). 
+
+If you're using an existing app, make sure the app's `accessTokenAcceptedVersion` is set to `2`:
+
+1. In the Azure portal, search for and select **Azure AD B2C**. 
+1. Select **App registrations**, and then select the your existing app from the list.
+1. In the left menu, under **Manage**, select **Manifest** to open the manifest editor.
+1. Locate the `accessTokenAcceptedVersion` element, and set its value to `2`. 
+1. At the top of the page, select **Save** to save the changes. 
+
+To create a new web app registration, follow these steps:
 
 1. In the Azure portal, search for and select **Azure AD B2C**
 1. Select **App registrations**, and then select **New registration**.