This was indeed a BIOS issue. Dell released 1.6.1 for the 5591 on Feb. 25. We have updated to 1.6.1 and the UEFI boot now works.
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RE: Dell 5591: TFTP works for Legacy but not UEFI
This was indeed a BIOS issue. Dell released 1.6.1 for the 5591 on Feb. 25. We have updated to 1.6.1 and the UEFI boot now works.