I don’t think it’s your computer. I have a Mini monitor 4k card that was working flawlessly but I upgraded to a new PC with a different Mobo over the holiday and now I have the exact same problem. I’m on Windows 11 and my new system doesn’t see the mini-monitor card in Device Manager or even in the Bios. I’ve done a half million restarts and re-loads of Desktop Video but nothing works. I believe this is a fail of BM.
My system:
Processor AMD Ryzen 9 3950X 16-Core Processor, 3501 Mhz, 16 Core(s), 32 Logical Processor(s)
Mobo- MPG B550 GAMING EDGE WIFI (MS-7C91)
RTX 2060 Super
64 gigs RAM
Windows 11 Home Version 10.0.22000 Build 22000