If you have several active subscriptions or are switching car parks, you'll have several remote controls in your app.
If you don't see the new remote control, just sync your app: recent changes may not have been picked up yet, and this should fix the problem.
Go to "Account" ⇾ "Synchronize"
Switching from one car park to another couldn't be easier: just go to the "Subscription" tab. Find the car park you want to access, then tap Enter/Exit
Repeat these steps whenever you want to switch remote controls, so you can move from one car park to another. 🙂