Try this, worked for me.
Use the USB Creator from UNRAID, Choose, 'customize' and click "allow uefi boot."
After that, on the usb you just made, rename the "EFI" folder to "UEFI"
After that, go into your bios config. Disable legacy, but keep secure boot off. Be sure to disable all legacy sources.
I was able to get my HP bios to auto boot using this method. Hope the helps for anyone who encounters this in the future.