Merge pull request #110002 from xamarsinx/patch-3

Update howto-restore-app.md

Author: Court72

articles/active-directory/develop/howto-restore-app.md

@@ -59,7 +59,7 @@ This is because organization-specific settings are stored on a separate object,
 2. Select **Restore app registration**.
 
 ## Permanently delete an application
-You can manually permanently delete an application from your organization. A permanently deleted application can't be restored by you, another administrator, or by Microsoft customer support.
+You can manually permanently delete an application from your organization. A permanently deleted application can't be restored by you, another administrator, or by Microsoft customer support. However, this does not permanently delete the corresponding service principal. A service principal cannot be restored without having an active corresponding application, so the service principal can be manually deleted, which is also permanent. If no action is taken the service principal will be permanently deleted 30 days after deleting the application.
 
 ### To permanently delete an application