Are you using the Tegui Series 8?
I just recently gave it another attempt myself, and I was actually able to connect my series 8 monitor using the unsupported devices documentation. Meaning that I now have full functionality of the Nuki Opener including ring to open and ring surpression.
This all without any soldering, just connecting the wires in the correct order.
Opener config successful, but cannot open the door
Take a look at the threat above, maybe it can be of use.
Cheers!