From VirtualBox VM (.vdi file) to a USB bootable ISO image have Secure Boot error

I created a VirtualBox computer.

Then converted the VDI file to RAW format and copied the file to a USB using Rufus, using the procedure depicted in “From VirtualBox VM (.vdi file) to a USB bootable ISO image“

But when I test the USB to Boot I got : “Selected boot image did not authenticate. Please press enter to attempt boot to next device.”

When searching for a solution it just say to reset the secure keys or change to Legacy. But that requires to change the BIOS config and that is not a viable solution for my case.

The purpose of the USB is recover Disk Image Backup of multiple PCs with the same USB without user intervention.