@Tom-Elliott Sorry I was helping someone else in a chat session so I’m now just getting back to this.

Taking Tom’s specilation that iPXE was not managing the boot files correctly on this system for some reason, I asked the OP to usb boot into FOS as a test. We’ve had to do this in the past with a few other systems that just failed to pxe boot properly. The OP was able to usb boot into FOS so that told me the kernel and the init.xz were fine. I created the boot image on Apr 6, so the kernel and inits were current of that time.

Will this process work for now for imaging, yes. Is this a long term solution, I hope not. Hopefully either a iPXE kernel update or a firmware update on the target computer will fixed the issue so that PXE booting can continue to be used in the future.