Problem adding Qubino Flush 1 Relay to HP23

I am really struggling to add a Qubino Flush 1 Relay (ZMNHAD) to my new Homey Pro 2023. I get the error message “something went wrong wen adding the device” every time. I have tried with the app version 4.1.1 and the new beta 4.1.5, but still no luck.

It works all fine with my old Homey Pro 2019.
Any tip on how to get it to work?