Adding note regarding several CDSs

When adding a new App Registration at the moment there are several Common Data Services in the List. In the List the only difference is the GUID that is shown. Its important to choose the correct one.

Author: BenediktBergmann

powerapps-docs/developer/common-data-service/walkthrough-register-app-azure-active-directory.md

@@ -66,8 +66,10 @@ App registration can also be done by an application developer or individual user
 7. Search for and choose **Common Data Service** under the **APIs my organization uses** tab.
 
     ![Select API](media/app-registration-select-api-page.png "Select API")    
-
-8. Click on **Delegated permissions** and check the options and click on **Add permissions**. 
+    > [!NOTE]
+    > It might be that you have several **Common Data Services** in the List. Choose the one that isn't the "PowerApps Runtime Service". In step #8 the service name will be shown.
+    
+8.  Click on **Delegated permissions** and check the options and click on **Add permissions**. 
 
     ![Delegate Permissions](media/app-registration-delegate-permissions-page.png "Delegate Permission")
     > [!NOTE]