Updating in case anyone is interested.
Got my unlock code about three hours after yesterday's post.
Was able to unlock using deepfreeze code first, then network unlock code afterward!
I called ATT to switch a nano sim to a micro sim and mistakenly gave them the (Metro PCS) S5 IEMI! Don't do this as it will prevent LTE from working. I asked the associate if I could switch IEMIs and she said sure. I gave her the IEMI of my M8, restarted the phone and LTE is now working.
Just flashed TWRP and the Alliance Rom about an hour ago.
Running fine on ATT here with unlocked bootloader.
So if you're on ATT and want an S5 with an unlocked bootloader, this is probably the cheapest option outside of buying on swappa, etc.