Interrail: unable to sell seat reservations due to user journey loop

 As I approach Paris, Interrail has entered a new and exciting failure mode:


I appear to be logged in, and a search for the route even brought up some results.  I click on "Book Reservation".  I get to step 2/2, which sounds promising:



One the one hand, this shows some of my details, providing further assurance that I'm logged in.  On the other hand, given that I only have one "trip" on my Interrail account, why does Interrail obsessively make me remind them which one of my one "trip"s I want to do things with, including every time I want to do anything with the app, including show my pass to a ticket inspector?  But more importantly on that other hand, clicking "Done" here does not go from step 2/2 to some kind of let's do this payment screen, but instead goes back to a screen just like the top screenshot of this post, which they entitle "Book Reservations", and which one might dub "step 1/2" to emphasise the incorrect nature of the cycle.

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