Shelly 1 intercom

Dear all, I’ve connected an intercom to a shelly 1 using this schema

The button is set in detached mode. Using the app I’m able to receive a notification when someone rings the bell and I can open up the door.
Unfortunately, in home assistant, I’m only able to open the door but I’m unable to receive notification because the related switch is always off. I tried with both original integration and with shellyforhass.
Any help will be appreciated.