@BPSTravis
Sorry for the slow response. Apparently I didn’t have email alerts set up yet, and I’m only at this job in the middle of the week, so just seeing your reply this morning.
I manually added the host and tried the host kernel arguments you suggested. This did not make a difference. I also tried with just xen_emul_umplug=unmodified and this did not work either.
I switched to the Intel NIC option, this did not make a difference.
UEFI BIOS mode was set already.