Hello:
I am trying to help my parents plan their trip through France this summer. I was looking into the reservation process and costs for certain trains and it seems that almost all the Nice to Paris trains say Pass not valid. Similarly the two earliest trains from Annecy to Nice said Pass not valid. These dates were for June and aren't even on sale yet so they can't be sold out. Is it just the certain trains do not allow use of the EU rail pass?
Thank you!