[EDIT: Turning off secure boot fixed my problem immediately.]
Apologies for replying to a dead topic, but figured this would leave the most continuity of the discussion. I am attempting to boot unraid on ESXi 8 and having issues with the usb not being found by vmware efi on boot. Interestingly when I boot into the bios and go to configure boot options -> add a boot option the first entry listed is an Unraid MBR. so obviously it can see the usb stick. What am I missing here?