Homematic item not working right

  • Platform information:
    • Hardware: Pi3
    • OS: Docker
    • openHAB version: 2.4
    • CCU2
    • HM-PBI-4-FM - 4way push button

I have problems integrating homematic functionality. The CCU2 and the button have been recognized as items. The event log responds by clicking on the test icons in the Homematic web interface, but not by pressing the physical button. The Homematic web interface notices these clicks, but openhab does not get that.

What am I doing wrong?

I found it!
I changed the connection from secure to normal and now it works.