Pretty sure I had answered to this, but it seems I didn't, there is indeed a problem with CD key being tied to player name making impossible at the moment to use an account with more than one CD key, the solution for now is transferring the character to an account you have access with the CD key you are using.
To do that, you will have to PM Zarathustra217 with all the information required to make such a transfer.
- Source player account
- Target player account