Microsoft is taking further steps to kill off Internet Explorer in Windows 10 by removing support for Microsoft Teams. Microsoft is no longer supporting Microsoft Teams in Internet Explorer starting on November 30th, 2020. Microsoft has compiled a list of 1,200 sites that are incompatible with Internet Explorer and will be redirected to Microsoft Edge. Microsoft also plans to block Internet Explorer across Microsoft 365 services on August 17th, 2021. Users may be able to use Teams, but there will be no guarantees that it will work correctly in the browser.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-really-wants-you-to-stop-using-internet-explorer/