1. In Outlook, on the File tab, 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. (In the search box on the taskbar, type Outlook, and then select it from the results.)