Being at Zwift HQ, I can see the session logs from your rides on our server. It looks like the most recent session was in the Zwift Cycling 101 workout plan, is that right? That happens to be a great introduction to structured workouts, introduces what Functional Threshold Power is, and why determining your FTP is super important. Stick with that plan! Day 3 is a mini ramp test that will determine your FTP number.
This also explains why the bike isn’t tilting. Another important feature of Workouts is ERG mode. In ERG mode, your resistance will not change as you climb / descend hills. Instead, ERG mode is training you to hit a wattage target and maintain it for X minutes. The idea is that you’ll being to understand where your power threshold is, and how long you can maintain a certain power output.
In ERG mode, the more watts you put out, the faster you climb the hill. What changes on a climb in ERG mode is your speed, not the pedal resistance. This is true for any resistance-controllable trainer, even ones that lack the tilt feature.
Your bike’s tilt feature comes into play during Free ride mode, aka SIM mode. This simulates the pedal resistance changes of going up or down hills, and the bike will tilt to match the gradient.
Next time you log in - skip the workout plan, and instead select the Watopia tab, then “Routes.” This will give you a menu of different routes available in that world. Scroll down and pick Hilly Route. You’ll come across some hills shortly after you leave downtown Watopia. You should quickly feel the pedal resistance change in SIM mode, and your bike should tilt accordingly.