Microsoft has reminded customers that Microsoft 365 apps and services will drop support for Internet Explorer 11 next month. Users still trying to connect to Microsoft 365 may face degraded user experience or connection failures. No new features will be released, and the daily usage experience will most likely get worse. Microsoft Teams had already dropped support for IE 11 on November 30, 2020. Microsoft also announced that it would also retire the browser on some Windows 10 versions on June 15, 2022, replacing it with the new Chromium-based Microsoft Edge.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-365-drops-support-for-internet-explorer-11-in-august/