With my Wahoo Kickr Bike, it gets connected as Power Source, Cadence, and Controllable, with the same name.
To make your bike tilt, two things must happen:
- It should be a free ride. Tilt feature is disabled in workouts.
- You need to press “unlock” button on that little control unit on the frame next to your right knee. The button is on the side. A blue LED will illuminate in the center, next to gear number indicator when unlocked mode is on. When it is locked, you can only tilt the bike manually by buttons on the left brake/gear switching unit. When it is unlocked, cycling app is allowed to control the tilt.
You are right that trainer difficulty also scales by how much it tilts, so when it is at zero, it would not tilt. You can check for this and adjust it by editing configuration file in you Documents folder if you cannot find it in the menu. It is an XML file, and it is easy to find which XML string contains trainer difficulty. The values there is from 0 to 1. But indeed, if you see it in the menu, it is probably not set as a controllable.