We were informed of a potential solution to those people still having troubles trying to create an account and getting a CD-Key in Use error. Sierra Technical Support advises that if you continue to have this error, you must e-mail Tribes2account@sierra.com with the subject line being your CD-Key exactly how it appears on the box. In the body of the e-mail enclose the e-mail address that was used to try to create the account with. They will get back to you as soon as they can.

In addition, Dynamix is trying to track down a "number of issues" outside of the CDKey problem and are asking for help.