I have tried importing oVirt exported VMs (which correctly imported and ran on a second oVirt host) both on VMware workstation 15.5.6 and VirtualBox 6.1.12 running on a Windows 2019 host without success.

I've also tried untaring the *.ova into the component *.ovf + image file, but the issue seems to be with the XML description which has both imports fail pretty much instantly, before they even read the disk image file.

From what I can tell, the XML created by qemu-img looks just fine, the error messages emitted by both products are very sparse and seem misleading.