Balcom HT 8802 with Ring Intercom, permanent door open issue

Hello Ring Community, after taking over an apartment I am trying to upgrade the existing doorbell system a bit. What I found out, it is at the front door a Balcom 500-501. In my apartment an intercom Balcom HT 8802 (is written on the circuit board). Now I have connected the Ring Intercom. So far it works almost everything. According to the app, this should connect as follows: sorry can only add one picture  If I do it this way, then the door opener is continuously buzzing, so the door is always open. As if someone would open. When I take out cable A-5 the it’s ok but cannot open the door in the app. Only by button. It looks to me that the Ring intercom gives a permanent signal to open the door ? Everything else works so far. Do you have any idea ? Maybe some different connection ? Or is the intercom maybe broken ? Thank you Br Thomas