@CwillQCA I also image multiple models of Dell machines using FOG. A couple of things to check:
Dell USB Adapters support MAC passthrough, but some Dell machines require this to be enabled in BIOS.
In my experience, machines with Secure Boot turned off and Bitlocker disabled work the best. Try decrypting the harddrive / disable secure boot (if not already done).
There are USB C Dell Ethernet Adapters also, those may work better.
It doesn’t make sense that FOG worked without Option 66 and 67 being setup, but presumably you are say it is setup on the router (just not firewall?). Double check that both your router and DHCP server (whether this is FOG server or something else) is setup appropriately.
May be worth getting one of the Lenovo machines and checking what the ipxe menu (image above) spits out different.
It says that DHCP fails, so I would assume it is something to do with the DHCP server or network setup. I am not overly experienced in FOG but hopefully my thoughts have helped.
