ok, samsung S6E
I was using your nfc unlock, I forgot about smart lock. Now it is working :)
I must say, it is ok cool, but, you realy have to be patient when you unlock it, you have to make your finger stiff, so the ring almost touch the phone b4 it works.

is it really true, that if I writh something on the nfc, it can no longer work to unlock my phone?

Dennis