Navigate as admin to:

“C:\Program Files\WindowsApps\MSTeams_23320.3021.2567.4799_x64__8wekyb3d8bbwe”

Note: The folder name will change after updates so it won’t exactly match my path above. Also navigating to the WindowsApps folder can be annoying, you have to c$ in or be logged in as an Admin to navigate to the directory.

Inside that folder is an msi “MicrosoftTeamsMeetingAddinInstaller.msi” copy this to another folder, open command prompt, and navigate to the directory where you placed the file.

We used PDQ to deploy this fix but you can also run this with command prompt:

msiexec.exe /i "MicrosoftTeamsMeetingAddinInstaller.msi" ALLUSERS=1 /qn /norestart TARGETDIR="C:\Program Files (x86)\Microsoft\TeamsMeetingAddin\1.23.33413\"

Keep in mind that as of writing the plugin version is “1.23.33413” but that might change in the future so keep that in mind. Not sure what would happen if you installed multiple different versions at once. So maybe don’t include the version number like I did and just overwrite the same directory every time there’s an update.

After installing close and reopen Outlook and you will have the Add-in back for all users.

Add the following reg key

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\Outlook\Addins\TeamsAddin.FastConnect]

“LoadBehavior”=dword:00000003

“Description”=”Microsoft Teams Meeting Add-in for Microsoft Office”

“FriendlyName”=”Microsoft Teams Meeting Add-in for Microsoft Office”