install teams on ltsc windows

 grab msix package 

https://learn.microsoft.com/en-us/microsoftteams/teams-client-bulk-install#option-1b-download-and-install-teams-using-an-offline-installer

eg:

https://go.microsoft.com/fwlink/?linkid=2196106

run powershell as admin

win+x+a

cd $HOME\Downloads

 Add-AppxPackage -path .\MSTeams-x64.msix