Having issues with using my registration pre-key from cd

[Raist]

If it's the one I think you are talking about, it was just for accessing the game prior to the official launch (we had to register separate keys for each phase--one for Beta4, one for Early Access, and one final one for official launch). After our initial time granted with the Beta/EA codes expired, everyone had to apply their normal registration key to continue with their same characters.

So, what you need is your official launch code, not your early access code.

[Edit:] Clicked the link out of curiosity... says it's down for maintenance. Not sure if they just did that to block people trying to use those codes, or if the registrations systems are actually down atm. It's not uncommon for them to be inaccessible for a while around maintenance windows, and we just had a rough patch of them as they are trying to resolve some server side issues.