Opener with 2 Wire Intercom


in my home there is an 2 Wire Intercom from this Shop

If no one is ringing there is no Voltage on my Intercom.

I was able to trigger my door opener because i have extra wires from my flat to the door opener only for nuki. I have to connect the blue to the opener and the purple to 12V. My Intercom on the front door have 12v and GND wire directly to the door opener.

But I am not able to get the ring decetion to work.