@astrugatch we did the opposite:

1. Converted the VM from Vmware with OVFTool in .OVA format
2. Converted the .OVA file in .OVF file
3. Then.. imported the OVF file in XCP with XCP-NG Center

@astrugatch @olivierlambert We recently converted a VM from Vmware with OVFtool. Did you tried to re-run the ovftool command to convert OVA in OVF? I get the same error as you and solved when we converted the OVA in OVF, then imported without any error with XCP-NG Center.