I noticed that a new version of the BIOS is available for Prime X299-A , version 2002 (2019/10/04).The short ChangeLog just says:*PRIME X299-A BIOS 2002 * 1.Add support for Intel® Core™ X-Series 10000 Processor Family* 2.Improve system performance an...

I had the same problem on my Prime X299-A *and BIOS 1902; downgrading the BIOS to 1704 fixed the problem for me.Oddly, Virtualization was showing available in both windows and the BIOS but WSL2 and Sandbox on Windows 10 stopped working after I had up...