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Home > Games and Applications > I'm having trouble with my retail CD key > I get a duplicate key error when trying to redeem my CD key
Duplicate key error
A duplicate product code error means that the CD key you are trying to register has already been redeemed to a Steam account. The key cannot be registered again.

If you received a duplicate CD key from your retail purchase you will need to contact the retailer who sold you the key. Steam Support cannot issue a replacement CD key.

For more information on retail CD keys, please read this FAQ.