I have exactly the same problem.
On my case my app is not live (only in internal test on TestFlight), so it may be related. The Grace Period is enable since a week now, so it's not related to broadcasting or cache time.
Any news ?
LaGregance
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4 years after the inital post we are still stuck on this issues.
Apple please, HOW ARE WE SUPPOSE TO MANAGE ERRORS WITH YOU SIGN IN SYSTEM ?