by train Barcelona 1033 - Paris gare de Lyon 1720.
But I cannot purchase the seat reservation here in Barcelona at the Inernational Ticket Desk at Barcelona Sants RENFE Main station.
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Having cued up for an hour, the clerk told me that from 11.12.2022 SNCF only could sell seat reservations to me And there is no SNCF Representation here in Spain.
I cannot get any reservation help at https://www.sncf.com
and only talk to a (limited) chatbot.
How can I get my seat reservation?