Launcher is asking for my registration code again and stopping me from logging on.

[Ivan5OH]

You have to register the actual game code if all you had registered before was the Early Access code.

Depending on where/how you bought it you may have to log in to amazon and check, or check email (including spam folders), or just check the physical box if that's what you got.

This worked for me. I digitally pre-ordered... find the receipt and enter in the product code. The early access code is different.