I am from Italy and i have this problem too (there are other italians players having this too, we commenting it on some italian pes forums)
I put the code with all capitals and i have this problem, so it's not that :/All I have managed to find from a thread on another site is to enter the activation code in all capitals/uppercase. I don't know if that will provide any help for any of you and I myself don't actually own the game so can't do any testing.