Hi, I’m having trouble booking two seat reservations for the RENFE direct service AVE INT #9742 from Lyon Part Dieu to Barcelona Sants on December 27th, departing 14:35 and arriving 19:23. As far as I can see, this train does not seem to show up on interrail.eu. It does show up on RailEurope.com and on HappyRail, but when I look for seat reservations for two people with an Interrail Global pass I only get the standard fee of about €100 each.
However, I am able to book a single seat for the standard Interrail fee of €10 through RailEurope. But when I then try to add a second single seat to my basket, I get an error message stating that Unfortunately it appears that this fare may no longer be available from the rail operator. It may be that the price or availability has changed. Please try performing a new search or selecting a different departure time or ticket type.
This would suggest that there’s only a single Interrail fee seat left. But on HappyRail it seems that there are plenty seats still available, and I thought this train type did not have limited Interrail seats. I also find it strange that this train does not show up on the interrail.eu reservation website, and the trains on the surrounding days don’t, either.
Can you help me understand what’s going on here? What would be my best way to proceed?

