Same here. I tried to open an apple technical support ticket with a small reproducible sample app but have yet heard back from them. If I use a new App ID, it fails. If I run my sample app against and App ID that I created a long time ago it works.

This is failing for my new app as well. I hope Apple chimes in and helps resolve it. I've seen lots of threads about this during the past 2-3 days.

Facing the same issue. Need this fixed urgently because Apple won't approve our app for our July 1 launch without Sign In with Apple.