TestFlight: 422 ENTITY_UNPROCESSABLE.BETA_CONTRACT_MISSING despite open support case

I am unable to proceed with TestFlight in App Store Connect. The operation returns HTTP 422 with code ENTITY_UNPROCESSABLE.BETA_CONTRACT_MISSING, detail "Beta Contract is missing", and title "Beta Contract is missing for the app."

I have already opened a support case about this issue, but have not received a response, and the problem is still occurring.

What does this error mean, where can I check or accept the required beta agreement, and what steps can resolve it if the agreement is not available in App Store Connect?

Thanks for the post, please look at this thread with the link to contact the Apple Developer Account Support

https://developer.apple.com/forums/thread/852650

Thanks
Albert  WWDR