Cannot boot to USB drive

I’m trying to override the admin password on an old Dell optiplex 3090. It’s running windows 10.
Right now I’m unable to get it to boot to a USB drive. The boot options are
Windows boot manager
Onboard ipv4
Onboard ipv6

Under add boot options it’s blank. So there’s no way to add legacy option. I turned off secure boot. And the boot from USB option is enabled.

I have tried using several bootable USB drives with no luck. The weird thing is, when I added a efi/boot/bootx64.efi directory and file on the USB drive, it did show in the BIOS, but when I booted from it nothing happened.
I used Rufus to create the USB drive

Which OS are you running from the USB?

I’m running pcunlocker enterprise edition from the USB. I created the USB bootable using Rufus and the pcunlocker enterprise edition iso