It's an NFC Ring. With your help, the phone is now recognizing it - thanks!

I'm still curious about the verification code issue, though. To clarify, I launch the NFCRing unlock app, and the screen says:

NFC Ring One Time Verification
Email: ___
Verification Code: ___
[Verify]

I tried putting my email but leaving the verification code blank, but then clicking the button just takes me to the NFCRing site. I'm a bit confused on how/where to get the code.

Thanks,
Jon

I apologize if this is a n00b question, but:

I won a free NFC ring. When I hold it to my phone (a Nexus 5), nothing happens.
NFC on the phone is working: I can tap-to-pay, other NFC tags I own work, and the extra NFC tag that came with the ring is recognized by my phone as a blank tag.

I did not receive an unlock code with the ring. I see that there is an "NFC Ring Unlock" app, but with no code, I can't use it.

So...do I need a code? Did I get a bad ring? Or am I completely missing some step I need to do?

Thanks,
Jon