The same thing happens to me too.
2 other accounts work OK but this one does not.
17500 [2022-06-18 21:44:34.555] [main] [info] Identity created at 1514455141 - using ID Schema 0
17500 [2022-06-18 21:44:34.556] [main] [info] ------------- Starting Sync (<EMAIL>@gmail.com) ---------------
17500 [2022-06-18 21:44:34.558] [metadata] [info] Metadata delta stream starting...
17500 [2022-06-18 21:44:38.567] [background] [info] Fetching XOAuth2 access token (gmail) for bcfa1827
17500 [2022-06-18 21:44:39.216] [background] [critical]
***
*** Mailspring Sync
*** An exception occurred during program execution:
*** {"debuginfo":"https://www.googleapis.com/oauth2/v4/token RETURNED {\n \"error\": \"invalid_grant\",\n \"error_description\": \"Token has been expired or revoked.\"\n}","key":"Invalid Response Code: 400","retryable":false,"what":"Unknown exception"}
***