Using ‘classic’ Outlook with the ‘new’ Teams can sometimes cause an issue with the Teams add-in. The add-in appears to load correctly and be active (File | Options | Add-Ins), but the Teams related buttons are missing from one or more of the Outlook toolbars, e.g. in Calendar the option to create a Teams meeting is not shown.
A possible solution:
- Close Outlook and Teams (don’t just minimise, exit Teams from the systray).
- Next go to Settings | Apps, and search for Teams Meeting.
- Locate the ‘Microsoft Teams Meeting Add-In for Microsoft Office’ entry and Uninstall.
- Restart ‘new’ Teams (and sign in if necessary) – this should trigger the add-in to be reinstalled.
- When Teams is running, launch Outlook and check the toolbars for the relevant Teams related buttons.