Hello, I am trying to make a reservation for an OBB Nightjet Train from Basel SBB to Amsterdam Centraal with my eurail pass. On OBB’s site, the route is available if I click the option to purchase outright, but it is not available when I select a seat reservation only. I cannot find it on partner websites (eurail, b-europe) either… I am frustrated because I purchased the pass with the intention of using it to book some of these night trains. 

I can select the intercity train that I understand is connected for only a 3euro reservation, but I would prefer a couchette to sleep on my journey. Any guidance on how to work around? I have thought about purchasing the cheaper reservation and upgrading later, but I doubt that couchettes will be available day of. 

Any suggestions? Thanks in advance!