Lately we have had a few activation issues where the code is typed in incorrectly. The problem was brought to my attention because there is no good error message stating this. It doesn't show up in the log good and there is no good user feedback. I will get this fixed in a future patch and get you some good feedback. For now, we will just respond that the code is wrong and to please check it. The best thing to do is to copy and paste the code. That way you can't get it wrong.
Sorry about this oversight. One bad thing about this is if you use manual activation, the game has no way of knowing the code is bad until you send in the user code. We will respond that it's incorrect and you'll just have to try again. But to avoid this, just please try to copy and paste the code.