@Tails
Mine worked better after I got rid of the android lock screen. If you're on Marshmallow then you might also no longer have the "No Lock" option anymore and I had to set mine to "Swipe" and then use https://play.google.com/store/apps/details?id=com.jusckeux.nolockscreen&hl=en to remove that.

According to Google support, "No lock" is no longer going to be an option. No idea if that is true but it is definitely missing from my phone now on 6.0.1. If you already had it set to that you seem to get to keep it, but I enabled the smartlock, which didnt work, and was not able to go back to "No Lock".

In the "NFC Ring Unlock Pro" app, in "unlock settings" at the very top right (in the title bar" does it say "enabled"? if it says "disabled", hit that (it's a button). Otherwise i'm not sure what else to suggest right now.

@m2b999 said:

I'm using OPPO Find 7 X9076 with ColorOS 2.0

Maybe this is an issue with the ColorOS? I don't know how close the color os is to android. Anyone have more info about this?

i feel myself like ncfnoob :(

i changed the pin to a shorter one and tested it again. works. thanks

[SOLVED]

@Rainer Got it now, I set a separate pin for the app. I don't still know for what this is... My phone and sd card are encrypted, so to get to the point where I can unlock the nfc app with this pin, I have first to login with either my strong password or with the ring.
So, can s.o. explain to me for what this pin is good for?
Then, another question: As I said before I solved the problem, I tried to login with my gmail account, which did not work. I would like to know to which destination the password was forwarded to, google or nfc ring?
Thanks, Rainer

I'll wait until after Google I/O
https://forum.nfcring.com/topic/290/google-io-dates