I think you mean a reservation, since your Eurail pass is your ticket. But I don't know why it should be a paper reservation.
Anyway, the best place to get a reservation for this train is via ÖBB. Choose "Seat only”. It's only 3€ and it's a digital reservation.
BUT note-for THESE INtern trains there is also a SUPlmt to pay of 10€-IF you do that at station in AT=Austria, then it includes the REServation (which as such is optional). The app cannot understand if its REServ or additional-this gives also errors and confusion. there is really no need at all to worry about it now.
I got the same issue booking from Venezia to Munich. Should I do the same and book seats only through OBB? I really have no idea how this works.....
I got the same issue booking from Venezia to Munich. Should I do the same and book seats only through OBB? I really have no idea how this works.....
Yes book via öbb :)
In this post you find both the Daytrain reservation manual and the Nighttrain reservation manual
Note that Eurail/Interrail pass users have to pay 10€ in 2nd class or 15€ in 1st class on these trains