Corporate & home users should gradually phase out all use of legacy browser Internet Explorer 11 as it is being gradually decommissioned in favor of EDGE.

Microsoft Teams Support Ends for Internet Explorer 11 Today | PCMag

If you’re one of the slowly diminishing number of internet users still relying on Internet Explorer 11 to surf the web, you’re about to lose access to a key Microsoft service. Today, Microsoft Teams stops supporting the aging browser.  The announcement that support for IE11 would end was made back in August, at which point Microsoft urged users to switch over to the Edge browser—available on every Windows 10 system whether you like it or not. Microsoft Teams won’t simply stop working tomorrow, though. Microsoft describes IE11 users having a “degraded experience or will be unable to connect to Microsoft 365 apps and services.”