Hi Edz,
I am using the same verison of Outlook (16.0.9126.2152) like you, and I am using the Teams (1.1.00.8751). And I can see the Teams add-in in Outlook client (using same Office 365 account):
So, we suggest you also try following:
- Update your Teams to the latest version, then Quit your Teams.
- Restart your Teams app.
- Then restar your Outlook client (after restarting Teams).
After did above steps, I can the Teams add-in in Outlook.
Meanwhile, please go to: File > Options > Add-ins to check if Teams add-in is listed under the "Active Application Add-ins", if no, please go to "Manage : Go" to select the Teams add-in:
Thanks,
Richard