Matter and Tado X

I have installed the matter integration and have several Tado X radiator thermostats controlled by 2 Tado X bridges. They have for old reasons been synced with Apple Home but I am not committed to that.

So when I try to add a device in the Matter integration it asks for the Matter setup code. This is not available in the Tado app but is in the Apple Home app. When I enter the code it thinks about it for a minute or so and then reverts to the screen asking for the setup code again saying ‘failed to setup device’. It has not added anything.

Any help please?