Cannot PXEboot with Intel X710 NIC (pxe structure was not found in UNDI driver code segment)

Hello, I've been having trouble with this NIC not booting off of PXE.  I've already set the 10Gbe interface as a booting interface in the BIOS.  During PXE, I get the error message: PXE structure was not found in the UNDI driver code segment.  When it first didn't work, I used nvmupdate64e to update the NIC firmware.  nvmupdate now tells me my firmware is up to date (at version 6.01).  However, I still get the same exact error message at PXE boot.  I have also tried enabling PXE flash firmware for the interfaces.  But I still get the same error after all these driver installs and configuration enables. 

lspci -vv | grep -i 'Intel Corporation Ethernet Controller X710'

81:00.0 Ethernet controller: Intel Corporation Ethernet Controller X710 for 10GbE SFP+ (rev 01)

81:00.1 Ethernet controller: Intel Corporation Ethernet Controller X710 for 10GbE SFP+ (rev 01)

./bootutil64e

Port     Network Address     Location     Series     WOL     Flash Firmware          Version

3          6805CA385DF0      129:00.0     40GbE    N/A       UEFI,PXE Enabled     1.0.66

4          6805CA385DF1      129:00.1     40GbE    N/A       UEFI,PXE Enabled     1.0.66

ethtool -i eth2

driver: i40e

version: 1.5.10-k

firmware-version: 6.01 0x80003483 1.1747.0

bus-info: 0000:81:00.0

./nvmupdate64e

Num      Description                                                       Ver.      DevId     S:B          Status

01          Intel (R) I350 Gigabit Network Connection      1.99      1521      00:0001   Update not available

02          Intel(R) Ethernet Converged Network             6.01      1572      00:129     Up to date

              Adapter X710-2

Any idea what I need to do to get this interface to PXEboot?  eth2 is the interface that I am using.