For him, the service id is the correct one. Because he is getting the code for web login. But when you use an app to get the code, you should use bundle id instead.as explained here: https://forums.developer.apple.com/thread/118135
Akbay
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for