I have been struggling with similar errors for days. My solution was eventually to take the development team id(in xcode copy the code that appears when you hover over the development team name) and put that into unreal-project settings- xcode projects-apple dev account team ID. all this time i was trying to input the name and didnt think to put in th e ID.
robotjellyfishpirate
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