Hey, I‘m struggling on booking seat reservations for the TGV in France. I‘m on the Website of french railway and clicked the Box „Seat reservation (I already have a pass)“ but when I continue I can only book complete tickets. Where can I book Seat reservations only? I want to go from Paris to Marseille and from Nice to Paris. Thanks in advance!
Seat reservation TGV
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directly at a French Station 
, via Booking Hotline of SNCF or via a Reservation service like Interrails own :)
Since SNCF removed the Interrail reservation from their website, I suggest calling them for a reservation:
https://www.sncf.com/en/customer-service/contact-us/telephone
At some point they might realise that they created a problem.
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