It would be really nice if Microsoft Teams is in IGEL OS
I’m afraid to say thta this will not be able to happen. 1) the Teams for Linux Client has been deprecated from Microsoft 2) even if not, the liecensing topic is a huge one.
But you can use: https://www.igelcommunity.com/post/how-to-igel-os-with-teams-pwa-progressive-web-app