Using Classic Outlook on Windows for personal email, calendar, and contact management
Found out about this the hard way. Teams (installed with machine wide installer) removed itself from 90% of our endpoints. We use Teams frequently, so big changes to Teams are not ideal. Installing NEW Teams worked, but we were lacking the plugin for Teams Meetings in Outlook. Several attempts at correcting the plugin all failed. Solution for us was to instruct users to download Classic Teams from the App Store. This allowed users to switch back to the "Classic Teams" and the Outlook plugin for Teams worked again.
Thanks to some of the posts here, the long term solution is to update Outlook to the NEW Outlook using the toggle in Outlook. It would be nice if Microsoft had prepped us or at least had some sort of warning about where to find your Teams meeting plugin. Maybe this was an afterthought by Microsoft.