Upvote:4
oui.sncf told me they couldn't find my booking as it wasn't made through their own site, and advised me to contact either the agency that the ticket was bought from, or SNCF themselves by phoning +33 892 353535 - it seems oui.sncf is just the online ticket sales operation, but I couldn't find a public-facing website for the SNCF parent company. It turns out I would have been well advised to phone the number! However I discovered this page on thetrainline's site, which says
On some occasions Trainline is only able to issue print-at-station tickets which need to be printed using a self-service machine at the station or can be collected from the ticket office at a train station in France.
...
Important! Your print-at-station tickets must be retrieved using your six-letter reference number and not your credit card.
So I concluded that I should be able to collect my ticket using the reference number and my surname. (My ticket wasn't booked with thetrainline as far as I know, but I assume this information applies to tickets sold by third-party agents in general, as implied by the text billet agence on the ticket machine screen as shown at the link.)
However when I got to Gare de l'Est (without much time to spare, as my Eurostar ran 30 minutes late due to boarding delays) the machines wouldn't recognise my reference number, and nor did the staff member in the ticket office - he said an SNCF booking reference should be all letters whereas mine contained a digit. With no time to spare before my train I had to buy a new ticket to Stuttgart.
My admin colleague is taking this up with the travel agent, but in the meantime the question is unanswered and I would definitely advise anyone else in this situation to contact SNCF themselves to make certain!