I reproduced the issue in TestFlight, and the logs mainly show errors related to the Apple account / protected data decryption, along with a TestFlight installation failure. Main errors observed: Failed to fetch an AMSDataProtectionClass encryption/decryption key with error = -34018 Failed to decrypt account property for accountFlags Error fetching LSApplicationRecord with Code = -10814 TestFlight install request returning HTTP 404 on the /install URL

I have this exact same problem. I did write to apple support three times but no response.