Yes, I have experienced exactly the same since Sun 15th Jun 04:30 (UTC+7) and it significantly impacts our customers. I also raised in this forum. Currently, Apple reports in https://developer.apple.com/system-status/ that App Attest is now having the performance issue. It has been already more than 10 hours that this problem still persists.

We are having exactly the same issue and it impacts our application and our users. Could Apple expedite the investigation to resolve the issue?