Upgraded to Windows 11 in Bootcamp – No Bluetooth

Hi, I am a complete newbie and not the brightest, so please be gentle. I wonder if anyone can help me. I have just upgraded to Windows 11 in Bootcamp on my MacBook Pro 2020 (last with Intel chip). The upgrade from Windows 10 to Windows 11 was successful except that I now have no Bluetooth and it doesn’t even appear in the device manager. Any help in restoring Bluetooth would be very much appreciated. Thank you in advance.