Before login in the account it only says how much it would cost.
Please note, that there is no direct nightrain Brussel-Innsbruck. Only Brussel-Vienna. You have to take in Cologne the Nightjet Amsterdam-Cologne-Munich-Innsbruck. This train is weeks long full, please book asap.
You can book directly via tickets.oebb.at using the ONE WAY TICKET option and choosing at adult the discount “Interrail/Eurail Global Pass”.
We never do USD here-its always in€-and for the direct section of NightJet its 14€/seat.
You CAN go=-but using 2 passdays (but you would need these anyway as last trip is next day)-and in seat only and even (in theory) without booking any seat: Use any ICE/other train in the day BRU->Kóln
Use overnight ICE 618 (from Köln MESSE=small dunky stop other side of river from HBF=main, frequent local trains in 2 mins or walk over bridge with 100.000 padlocks to prove eternal love, arr M around 6.00. Get some food (plenty of options to far left and down stairs-f.e. Yorma or REWE toGO-and then next train to Inn (ev 1 or 2 hrs)-direct trains take round about route, direct trian line via Garmisch=mountain views partly suspended due to recent crash