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Working ok here after reading this, I upgraded to test before it hits users.

Yes have exactly the same problem. Although I used the machine installer the plugin is searched in the user profile.

Co-worker says it's hit and miss. What he found was that if there were multiple old versions of the add-ins, the users had issues. Cleaning up and reinstalled cleared up the issues. I only have one previous installed version in my profile and may not have been a recent version as I don't use Teams much in the Citrix session where I use Outlook.