42 votesAnonymous commented
go to regedit, navigate to Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Addins\
Change load behavior to 0.
Right click on the Addins registry key and go to permissions. Go to advanced, the change the owner to yourself. Disable inheritable permissions, then remove all existing permissions. Add the local administrator with full permissions. Then add the local everyone account with read permissions.
This has kept the teams addin from turning back on since it only has read permissions to that registry key.