James Nichols at Warhammer Online: Age of Reckoning has addressed the issue of Target store pre order codes not working in the Mythic Account Center. No, you aren't entering the code incorrectly, there has simply an error at the printer.
Since bringing the Account Center live it has come to our attention that some Target Pre-Order customers are encountering errors when attempting to register their keys.
We have discovered that due to mis-printing the letter "Q" is displaying as an "O". Pre-Order keys will never contains "O" or "0". Be sure that in any scenario where there appears to be an O that you enter "Q" instead.
We apologize for this inconvenience. Thank you!