TestFlight app became invalid when testers upgraded to OS 14.2

We've got 3 MacOS apps on TestFlight that all suddenly became unusable to our testers who upgraded the OS to 14.2.

The error message says: "The application <App Name> can't be opened. -10673"

But also there was another window that opened up stating "The beta app, <App Name>, is no longer available. The provisioning profile is invalid"

The provisioning profile doesn't specify OS versions - it's signed with distribution and installation certificates for AppStore.

These apps have been used that's been successfully provisioned, uploaded, downloaded and tested by various testers prior to now.

Each app has an explicit Apple ID and provisioning profile - all still valid.

What would cause this? How can I fix this?

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