I turn of secure boot in every BIOS. However, some do not show that setting.
Here is an option that has worked for me.
Boot the PC and launch Boot Selector (F8, E12 or look it up)
Select the Ventoy disk
If you get an error, select any key
It can look confusing
Enroll Key From Disk
VTOYEFI
Enroll This Key
Continue
Yes
Reboot
Ventoy should boot.