Why cant I restore my purchases

This game is super good!i think all you should get it but the only problem about this right now is that I cant restore my purchase.i spent like $10 or more and when I try to restore it says it cannot.so I am kindly asking to fix or help me restore my purchases.Overall I love this game,5 STAR FOR ME!!!

FireWolfGamer about Real Steel, v1.33.5