Ok lets hit the common things here.
What exactly do you have configured for dhcp option 67? I’m going to guess the computer is in uefi mode so dhcp option 67 needs to be ipxe.efi.
Ensure that secure boot is disabled
Not an issue at the moment but will be.
Make sure the disk mode in the bios (firmware) is configured for ahci mode not the default of Raid-On.
Ensure you update the FOS Linux kernel via the web ui by going to FOG Configuration -> Kernel Update. Make sure you download both the 64 and 32 bit kernel for 5.6.18. You will need this kernel to support the newest hardware.