your answers helped me to find this solution : https://stackoverflow.com/questions/58303509/how-to-add-permission-to-simulatortrampoline-to-access-specific-folder
HKosteo
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
Post
Replies
Boosts
Views
Activity
I managed to change my Sandbox tester ID by doing this : delete old tester ID (appStoreConnect -> User -> Testers)
Clean Build Folder
Rebuild and run the app
the sign-in dialogue with the Apple ID field pop up again
The Source Control Refresh File Status helped for me.