If you still can't find the Teams add-in, do the following:
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Sign out of Teams and then restart it.
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Close Outlook and then restart it.
If you still don't see the add-in, make sure that it isn't disabled in Outlook:
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In Outlook, on the File tab, select Options.
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In the Outlook Options dialog box, select Add-ins.
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Confirm that Microsoft Teams meeting Add-in for Microsoft Office is listed in the Active Application Add-ins list.
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If the Teams Meeting Add-in is listed in the Disabled Application Add-ins list, under Manage, select COM Add-ins, and then select Go...
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Select the Microsoft Teams Meeting Add-in for Microsoft Office checkbox.
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Choose OK on all dialog boxes, and then close Outlook.
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Restart Outlook.