Download this VROC driver and extract it to a USB drive.  Plug the VROC driver USB together with the Windows installation USB.  While you are at the selection destination screen, click on load driver and selecting driver from USB.  Once the driver is installed, your NVMe drive will appear.
I wonder how 7920 towers support booting Windows from an NVMe SSD? I have an NVMe SSD in a PCIe slot through a third-party adapter.  I have the BIOS updated to the most recent version.  The SSD shows up in BIOS just fine.  Ubuntu boots fine.  But the Windows 10 installation USB drive doesn't see the SSD unless I choose legacy booting and AHCI.  The same NVMe drive works fine in a 3630 tower. I read somewhere online that using UEFI booting with secure booting disabled worked for someone, but that didn't work for me.  I'd like to upgrade to Windows 11 so I think I need UEFI booting. Would an NVMe Flex Bay work better?  Any other thing I could try (besides switching to a SATA SSD)? Thanks!
7920 Tower NVMe SSD not seen in Windows installation media