Only perform this on a device you legally own.
Specific step-by-step varies by OEM (Samsung, LG, Huawei, etc.).
The token stored by Account Manager 6.0.1 has expired or been revoked. This often happens after changing your Google password or revoking a device from your Google Account dashboard.
The Android Google Account Manager 6.0.1 is both a hero and a relic. It faithfully authenticates billions of login requests on legacy devices, but its architecture cannot keep pace with modern security demands. If you are troubleshooting errors, start with clearing cache and re-adding accounts. If the problems persist weekly, recognize that it’s not a bug – it’s the natural sunset of an operating system.