Yeah I'm seeing the same thing on an iPad pro on 17.2 and Xcode 15.0.1 when logging into TestFlight, no idea what's causing it, it just won't let me use TestFlight.
I think this is a problem at Apples end with the account, I tried a different TestFlight account on the same device and it worked ok
Topic:
App Store Distribution & Marketing
SubTopic:
TestFlight
Tags: