Diablo 3 Authentication Key error

If you purchased or pre-ordered Diablo III through our online store or are part of the WoW Annual Pass promotion, you will not have to enter an Authentication Key to activate the game license for your account, this was done automatically during the purchase process. Once you have installed the game, simply log in with your Battle.net credentials.
If you have a physical retail box copy of Diablo III and are receiving an Error 12 message, please check your Battle.net Account Management page and make sure you have claimed your Authentication Key.

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