Oh, I don't know if it can be called a solution.
When I first visited earlier this year and installed it I'm pretty sure the instructions were:
-
buy a ticket from the list of options in the app before you board
-
Manually activate the ticket in the app once you've boarded
* Not sure the tickets you buy in app work for all modes of transport ...
In hindsight that seems a lot easier and less confusing then I remember. But still sounds like a nightmare for newcomers.