I had this problem as well. It was down to the zipcode not matching the address registered to the card. Unfortunately for me i live in Ireland where we don't have zipcodes. I had to use my friends card who lives in the UK and it worked.
This is happening to me as well. I don't know what to do, other posts say that it has to do with the address and postcode, but I've no idea, I'm at my wits end!
This is happening to me as well. I'm from Ireland and we don't have zipcodes! I've tried it with n/a, or with 00000, I don't know what to do, I've missed my deadline now, and sent loads of emails, but nothing!
Please help me!