Our team first encountered this issue on 11/11 for employees who autoupdated. We made another new TestFlight build later that day and the issue seemed to go away on its own.
Today (11/18) the issue has resurfaced again for people who autoupdated, but not for people who manually updated. The issue goes away when you download the App Store version and reinstall the same "expired" build from TestFlight.
For both 11/11 and today when we noticed the issues, we hadn't seen TestFlight System Status report issues via https://developer.apple.com/system-status/. Seems like a transient issue from Apple.
skuni
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