Balcom HT255 + Nuki opener

I have a Balcom HT255 intercom at home.
Unfortunately, this model does not appear in the Nuki app.
I am supposed to connect the doorbell wire with the WAGO clamp.
These should be the last two wires in the blue terminal, right?
The first two should be the bus connectors a/b, or am I seeing this incorrectly?

https://ibb.co/PvJPcxBx
https://ibb.co/XkJxNF0z