Ritto Twin2Bus 17573/01

we are using Nuki some month now. Our Ritto is not listed as a compatible product.
I configured Nuki like we are using Ritto 1763070
Here we have Ritto Twin2Bus 17573/01. While I configure the Nuki everything is working!
Ringing the doorbell cause that Nuki open the door perfectly. But when we finish the configuration and Nuki Dooropener is in the normal mode, the ring2open function is not working.
I hope that someone has an idea and we have a chance to get the comfort of ring2open.
Thanks for your help