Woops missed that above the picture. Just guided a friend through an XCP-NG install with an R720xd that did the same thing in UEFI. Swapped to BIOS and it worked fine.
H700 cannot be flashed from what I can sell, you’d need to swap so something like an H200 or an H710 to flash to IT mode. Or, you can use RAID on the H700 instead of ZFS.