Outlook keeps disabling the MSTeams Fastconnect addin which removes Teams meeting functionality from the Outlook Calendar view. To restore this, I used the following steps.

  1. Launch RegEdit.exe
  2. Navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Addins
  3. Verify TeamsAddin.FastConnect exists.
  4. Within TeamsAddin.FastConnect, verify LoadBehavior exists and is set to 3.
  5. If LoadBehavior has a value other than 3, change it to 3 and restart Outlook.
    For more details about how to troubleshoot this issue, you can refer to:
    https://learn.microsoft.com/en-us/microsoftteams/teams-add-in-for-outlook#troubleshooting

If the add-in has been disabled, you can try to follow these steps to prevent it:

  1. Launch RegEdit.exe
  2. Go to HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Resiliency
  3. Delete the DisabledItem if there is.
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