If you are trying to enter in a gamestop digital pre order code and are getting an invalid code error, remember that gamestop did not support pre loading for their codes, and the codes go live at 12:01am PST. So they won't work until 2:00am CST, 3:00am EST, etc.
For those (like me) eager and impatient! :-)
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A little off topic, but does GameStop's Digital Guardian Edition come with the Vanguard Armory as part of the digital package? I didn't get a separate code, should I have?