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I would let anyone know, that people with this problem should not fear the problem anymore.
If you are away from your computer, in school or work etc., let me tell you that this "bug" has been fixed.
My early access did not work even though it was redeemed correctly.
But after getting the Retail key and the Explorer's pack key, my account does now work, and I guess that means everyone with this similar "your login information is incorrect. Please try again" should no longer have this problem.