1. In Outlook, on the "File" tab, and select "Options."
  2. In the "Outlook Options" dialog box, select "Add-ins."
  3. Confirm that "Microsoft Teams Meeting Add-in for Microsoft Office" is listed in the "Active Application Add-ins" list.
  4. If the Teams Meeting Add-in is listed in the "Disabled Application Add-ins" list, under "Manage," select "COM Add-ins," and then select "Go."
  5. Select the "Microsoft Teams Meeting Add-in for Microsoft Office" checkbox.
  6. Choose "OK" on all dialog boxes, and then close Outlook.
  7. Restart Outlook.