Intercom and Comelit 6701W

I installed Ring Intercom on a Comelit 6701W simplebus 2 wires. Setup was easy. The problem is that if I try to open the door from the app I can only do it with the third click of the button. Moreover I don't hear badly who speaks from outside and they don't hear me at all. The configuration failed, but I forced it to allow me to use the application. I've contacted Ring Support but haven't received a response yet. This is the wiring.  Do you have any suggestions?