I've just installed W10 2004 on my test server, and the VM cannot access its main storage. I did a quick search, I saw a lot of posts resembling this error but for VHD /VHDX files (easy enough to fix permissions on those).
However I'm clueless as to how to set permissions on a physical device, I tried the builtin Get-Help feature from W10 before posting here.
I do not have rights to add a pic yet, but the error says :
Hyper-V VMM service Account does not have permission to open attachment ...\scsi#disk&ven_nvme&prod_samsung_ssd_960