For iOS it worked pretty well without using the tadoX-bridge.
- In the tado app, allow connecting to your home.
- In Apple Home: add new tado x device, scan the matter code of the valve
- In tado: add new device and scan the same code again. Follow the installation steps
- In Homey: add new device. Choose the iOS-option. Scan code again.
Works perfectly without a tado bridge. Home, tado-app and homey can control the valve without any restrictions or limitations.