Ring Intercom Problem: Ritto 17230/.0

Hi There I got my Ring Intercom yesterday and did wire it up with my Ritto 17230/.0 as described in the setup guide. I did use the wiring cables „B“ and connected B1 (Ring out) > a (Ritto in) and B2 (Ring out) > b (Ritto in). What is working? - unlock the main entrance - get notified if someone presses the button at my apartment - voice (mic + speaker) is working The issue is that I‘m not getting a notification if the button outside is getting pressed. I already tried all possible wiring combinations (almost killed the Ritto) but nothing helped - the issue persists. Did anyone have a similar problem and was able to solve it? Or does anyone understand how the Ritto twinbus system works and what I could try to fix this by myself? Any help is appreciated :slight_smile: Regards, Koopa