Hi @Clarkson, Michael ,
Are you using the New Outlook for Mac? If this is the case, there's no Teams Meeting option on the ribbon anymore, instead, we can turn on the toggle of "Teams Meeting" when scheduling a new event from the account which has the Teams license:
If you are using the Legacy Outlook, I checked it on my Outlook for Mac(16.60) and the Teams Meeting option is still there so seems to me that it's not likely to be a issue with this particular release:
Given this, I'd recommend trying to remove the account which users Teams from Outlook, then add it back and see if the Teams Meeting add-in can be seen. Should it still doesn't work, please log in to Outlook web app(outlook.office.com) and see if the Teams meeting option is there, see Teams Meeting add-in in Outlook Web App.
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