[SOLVED] Creating a Debian VM (UEFI/OVMF)

The EFI disk in PVE is the storage to all EFI related information in your computer. You still need the EFI partition in your OS in order to boot. So in order to have a working UEFI-VM, you need the EFI disk in PVE as well as the EFI parition in your guest OS.