It is available right now to book on tickets.oebb.at (no booking fee) :)
Add Eurail/Interrail as a discount and select one-way tickets (not seat reservations). It should work.
Copying rvdborgt’s answer in another thread :
“No, N/A just means that the app doesn't have a price. It may mean it doesn't exist in this train. Price of a seat is also wrong, as is often the case in the app. I usually ignore any price mentioned there.”
Hi
I have gone to do this and it’s saying £20+ for just a seat reservation (not a couchette or sleeper)- does this sound right to you as it seems like quite a bit for a seat?
Thank you
That's a quite expensive train. A seat from Split to Sevnica is currently available for €29.90, no pass needed. This is a non-refundable, non-exchangeable fare. A pass reservation is €54.90 (refundable).