Hi @IBN
Does this problem only happened in this specific users?
If you still don’t see the add-in, make sure that it isn’t disabled in Outlook.
- In Outlook, choose File and then Options.
- Select the Add-ins tab of Outlook Options dialog box.
- Confirm that Microsoft Teams Meeting Add-in for Microsoft Office is listed in the Active Application Add-ins list
- If the Teams Meeting Add-in is listed in the Disabled Application Add-ins list, select COM Add-ins in Manage and then select Go…
- Set the checkbox next to Microsoft Teams Meeting Add-in for Microsoft Office.
- Choose OK on all dialog boxes and restart Outlook.
For more details about its troubleshooting, you could refer to this article.
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