I need to catch the INT 480 train from Rijeka to Budapest tomorrow, the intarrail application says the seat reservation is mandatory, the interrail website won’t let me get a seat reservation, I contacted customer support and they redirected me to the Hungarian railway website, but I could not book a seat reservation alone, it only let me buy ticket+Seat reservation (even if I checked the box that said I already have a ticket/pass). From the Hungarian website it seems a though a reservation is not mandatory, as when you buy a ticket it asks weather or not you want to reserve a seat, but the interrail application says it is. So which is it ? How can I get a seat reservation ?
PS: I know this is last minute, I’ve been trying to solve this issue for a while but customer service is slow and the websites unclear.