I ran into the issue that Microsoft Teams was freezing when joining a call (Windows 10).

The place to check the Teams logfile is %APPDATA%\Microsoft\Teams\logs.txt. In my case, just before the freezing occurred, the following line was visible:

Mon Mar 08 2021 15:46:12 GMT+0100 (Central European Standard Time) <32256> -- info -- BluetoothLE Desktop: ble:burst-scan requested

In my case, therefore, the fix was to disable Bluetooth on my Windows machine. This is not ideal and there might be better ways. However, in my case I wasn’t using Bluetooth because my headset is connected via the vendor’s Bluetooth dongle.