Ah. You may have issues with the 2920 reading NTAG203. The one I have here simply does not like NTAG chips and will only function with mifare cards/fobs.
I found it's key storage design to be ridiculous, every time you enter programming mode it dumps its memory and you have to enter each key again.
You can prove to yourself that it uses UID by programming the cards into the door lock, then re-writing what's on one of the cards - it should still work with the lock fine regardless of what you've personally got stored on it.
Now for the kicker, as I figured out (I still stare at the 2920 sitting half in and half out of it's box in the dunce corner of the lounge room) the 2920 doesn't like the NFC Ring.
This would be due to it's refusal to work with NTAG203, the NFC chip which the NFC Ring is based on.
