I tend to use it as a Doorbell Button, but it only reacts if I press it supershort, every normal press is ignored.
It is connected via Deconz Conbee2 Stick, and when I pair it with a light directly in Deconz it always works, but HA seems to onyl get a notification when it is ultra short pressed.
You could go to the Developer Tools and under EVENTS section, where it says events to subscribe to, place deconz_event, and then click start listening. Once this is done click the button, and you should see some output like this:
I am not sure all the events this button has, but you can use this method to find out, i.e. single tap, double tap, triple tap and hold. The event number will change and you can correspond that event to that type of button press.