All the builds uploaded to TestFlight have expired.

We are having external testers use TestFlight through a public link. Without any prior notice, all of our TestFlight builds suddenly expired, and even newly uploaded builds encounter errors before being released. We were able to resolve the issue twice through inquiries, but the same situation occurred again immediately. We are now making a third inquiry, but could you please advise us on how to avoid this problem?

All the builds uploaded to TestFlight have expired.
 
 
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