Hi Lucy, I’m having the same problem on the same route (IC to Montpellier). I wonder, did you find a solution to this? I contacted the support already, but no reply yet.
Ok I got a reply from customer support, in case it helps anybody else:They told me to use the booking tool here https://travel.b-europe.com/Eurail-GE/en/booking-tgv#TravelWish
Don't be shy and let us know about your challenge.
Already have an account? Login
No account yet? Create an account
Enter your username or e-mail address. We'll send you an e-mail with instructions to reset your password.
Sorry, we're still checking this file's contents to make sure it's safe to download. Please try again in a few minutes.
Sorry, our virus scanner detected that this file isn't safe to download.