Gmail email works, but Google Calendar stopped syncing

Because this happens on two computers and reauthorizing the account did not help, it is more likely a problem with New Outlook’s Google Calendar connection than a local Windows or Outlook cache issue. The old calendars you see may simply be cached copies.

First, check exactly which part of the connection has failed:

1. Open Google Calendar in a browser and create one test event in the primary Google calendar.
2. Create another test event in one of the newly created calendars.
3. In New Outlook, make sure both calendars are selected in the calendar list, then check whether either event appears.
4. Create a third test event in Outlook, carefully selecting the Gmail calendar rather than an Outlook.com or Microsoft 365 calendar.
5. Check Google Calendar on the web to see whether that event arrives.

If the primary Google calendar also fails in both directions, the account’s calendar connection is broken. If the primary calendar works but newly created calendars do not, the problem is more specifically with Outlook discovering or synchronizing additional Google calendars.

Since you have already removed and reauthorized the account, repeatedly doing that is unlikely to help. Report it through Help > Support or Help > Feedback in New Outlook and include:

• The approximate time of the test events
• That Gmail mail still synchronizes
• That calendar synchronization fails in both directions
• That the problem occurs on two computers
• That full Google Calendar permission was granted again

Until it is fixed, create important events and invitations directly in Google Calendar. Do not rely on Outlook-created Gmail events if they are not visible on calendar.google.com, because they may exist only in Outlook’s local or cached view.