Set Teams as default in Outlook app

Set Teams as the Default Chat App for Office

1. Open Microsoft Teams.
2. Go to Settings > General.
3. Check the box for “Register Teams as the chat app for Office.”

Enable the Teams Add-in in Outlook

1. Open Outlook.
2. Go to File > Options > Add-ins.
3. At the bottom, next to Manage: COM Add-ins, click Go.
4. Make sure Microsoft Teams Meeting Add-in for Microsoft Office is checked.
5. Closed and restart outlook