Error Code:

Error Code	50173
Message	The provided grant has expired due to it being revoked, a fresh auth token is needed. The user might have changed or reset their password. The grant was issued on '{authTime}' and the TokensValidFrom date (before which tokens are not valid) for this user is '{validDate}'.
Remediation	Expected part of the token lifecycle - either an admin or a user revoked the tokens for this user, causing subsequent token refreshes to fail and require re-authentication. Have the user sign-in again.