Ditto for me. I do those steps, it works, but then I get the "expired" error a few hours later and the build is unusable. We've had to contact all our TestFlight users and tell them to hold tight until Apple gets this fixed.
steebee
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution