We have recently discovered that some retailers were selling codes for versions of the game outside of their territory, which may have been previously used or specific to the region they purchased the codes in. The best thing to do if you're getting an error that the code is invalid or getting an error regarding the region is to contact the retailer for a refund of the purchase price. If the retailer will not provide a refund, we recommend disputing the purchase with your bank or credit card company as the goods were not delivered.
We encourage our customer to seek out known retailers and appreciate being advised of any fraudulent sales.