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Sign-In Error 5000811 — Unable to verify token signature. The signing key Identifier Does Not Match Any Valid Registered Keys

The error message "Sorry, that didn’t work. Please go back to office.com and try again” is probably one of the most vague that I've seen.  It's up the… Read the rest “Sign-In Error 5000811 — Unable to verify token signature. The signing key Identifier Does Not Match Any Valid Registered Keys”