hello everybody! 

i have a 2nd class youth interrail pass, but the woman at renfe (spain train organization) sold me a seat reservation for first class for a train from spain to france bc the rest was sold out (even though she knew that i had a 2nd class pass). 

on the seat reservation are 2 qr codes and it says ticket+reservation. now i am confused if i am allowed to go on this train or not, can you help me?