[Users] OAuth2 refresh token expired/revoked

[Dan N]

Google server no longer accepts OAuth2 refresh token that's been working
for several months (In Production).  One possible cause for this is if the
server issued a new refresh token and claws-mail never saved it.

Any options at this point besides going through the full authorization
process again?

Relevant part of debug log:

** Message: 05:42:55.437: OAuth2 access token not obtained
1.1 400 Bad Request
5b
{
  "error": "invalid_grant",
  "error_description": "Token has been expired or revoked."
}
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