Hello,
I bought a "4-day in 1 month" Interrail pass in 1st class for me and my girlfriend (for a trip in Austria). It is not activated for the moment.
The 1st reservation I would like to do is a "sleeper coach" for us in an ÖBB night train (for the return journey from Vienna to Zurich (for the night of December 23rd to 24th) and I would like some help about this issue if somebody already faced it:
When I check availability on this train via the Interrail.eu website, it indicates that "pass holder reservations may be sold out for this connection". (see screenshot below)

However, when I try to do the reservation via the ÖBB website (with choice of “Interrail discount”) there is availability : I can book a sleeper coach for 188 euros for 2 people. See screenshot below :

Note: I think it's normal for the price to be so high for a simple reservation. Indeed, the price of such a berth on this route is around 400 euros.
I used the procedure described on the Interrail website on screenshot below :

Do you think I can make the reservation on the ÖBB website? Or should I avoid to do it because the availability shown on the Interrail website isn't ensured ?
I am afraid I haven't understood how the Interrail pass works.
I thought one bought the pass and then made the required seat reservations (if necessary), but there's the requirement to add each journey to the pass that I do not really understand. I am worried that if I make the coach reservation and then I try to add this trip to the pass, it could be refused by the Interrail app.
How can I avoid this risk?
If I try to add this trip on the pass, I guess the pass will be activated and then it will not be possible to get a refund of the price of the pass ?
Bertrand
