Yes currently facing the same issue but we are using Xcode cloud which uses Xcode 15.0.1 (15A507).

What worked for me was completely removing the user from the app and then adding them again. I did this by deleting the group they were in and selecting "remove completely from app". This will remove them from any other group that they were added to. After that I created a new group and added them in as new tester.