I have this error when I doing seat reservation. But my friend can do the same booking without error!
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Then maybe your friend should make the booking for you too (at least if you’re travelling together). You will be able to sit together then (or at least close by).
Alternatively you can book your seat here: https://travel.b-europe.com/Eurail-GE/en/booking-tgv#TravelWish
For which you need a pass cover number:
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