The account synchronization has stopped and this is the error in the sync logs:
Google Workspace user account is suspended or Google Calendar is turned off.
This user will need to either turn on the calendar for their Google account or let their email admin restore them from the suspended list:
- Turn Calendar on or off for users: https://support.google.com/a/answer/6002940
- For their email admin: https://support.google.com/a/answer/1110339