@Paladin1 Thanks for the full logs. The autoexec.ipxe ... Not found lines are normal for your install. The installer removes that file from the TFTP root on purpose.
The ASSERT ... udk2010 ... HiiLib.c lines do not come from FOG or iPXE. They come from the target machine’s own UEFI firmware. iPXE starts, then the firmware fails an internal check and stops.
To narrow it down, please tell us:
The make and model of the target machine, and its BIOS version. A photo of the whole screen, from the first line. We need the line that starts with “iPXE” and shows its version. Is any other DHCP server active on that network, such as your router? If yes, what boot file (option 67) does it give out? Does the target boot to the FOG menu in Legacy/CSM mode, with UEFI off?