Jees, show's what a mess all this connected stuff is.
App connect, that allows car play/android auto, IF, it's not active would come alive immediately activated by the dealer and you could plug your phone and use immediately.
Car net, that's a whole different load of nonsense that allows exciting things like sending nav destinations from your laptop to your car. This is car specific and transferable with sale. You battle VW websites to register using the VIN, then wonder why you bothered.
So... if you are trying to use car play, have paid, then take it back.