Ok so I just receive my code for the CE digital game, but I already have an account because I played since 1.0 (not legacy) and also played at the early release, so how to I link the code form the CE to my existing account, because in the SE account page it says upgrade to CE but that only gives me the option to pay, and the page to redeem bonus item codes gives me an error when I input the serial number.

Anyone know what I need to do?