Many thanks!
If you have reserved then you will already have been allocated a carriage and seat number. The only way to pick a specific a seat is to use a SNCF ticket office, station ticket machine or by phone. I do not know f they are able at a ticket office to change the seat allocation on a reservation that has already been issued. You can see the train/carriage/seat layout but not book (for passholder) or alter the reserved seat at https://www.sncf-connect.com/fr-ch/ website or SNCF Connect app. Eurostar is very unusual in being able to alter your seat reservation through their website/app. Thank you for your message!I tried many times to enter my “Dossier voyage” and my last name to look for my booking via sncf-connect.com, it keeps saying that they are not allowed to see my booking.
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