Problem linking heatit z-push 8 and homey

I am trying to add a Heatit z-push button 8 to my homey pro, but I always get the error message «there is no app installed», even though the heatit zwave app is installed on homey.

Du anyone have a suggestion what I can try here?

Why don’t ask in the official HeatIt thread? This is a thread where HeatIt itself and of course other user answer questions about HeatIt products.