Organizing, editing, and coordinating meetings and events within Microsoft Teams calendars
To help us better understand the problem, could you please let us know which Outlook client you are using?
- Outlook for Windows (Classic Outlook)
- New Outlook for Windows
- Outlook on the web (OWA)
- Outlook for Mac
- Outlook mobile app (iOS/Android)
Since you mentioned you install add-in, it could be you are using Classic Outlook. If yes, quick check in File > Option > Add-in > Go > Make sure Teams add-ins is enabled.
Additionally, you will need to sign in Teams desktop with the same account as in Outlook in order to have Teams meeting button. when you schedule, Teams link will be added automatically.
If you are using New Outlook Windows/ Outlook Web, the Teams link will be added when you done scheduling and click send. make sure you enable Teams meeting.
You can read more details here: https://support.microsoft.com/en-US/teams/meetings/schedule-a-microsoft-teams-meeting-from-outlook
If none of this is your scenario, please provide which Outlook you are using.
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