So to be 100% clear about this, you can take all the trains that are listed on the interrail website (in France) even the TGV or the night train, but you only need a seat reservation? not a full ticket? Furthermore, I cant seem to find where i only can buy a seat reservation on the sncf website for the night trains vom Paris to Nice?? Where should i buy the seat reseravtions for the TGV? Some help please x 
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Seat reservation for Interrail are not sold online by SNCF, only by phone.
 No need of Pass Cover Number.Â
https://www.sncf.com/en/customer-service/contact-us/telephone
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 Press #85 for English, no booking fees, reservations are sent via e-mail
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