That being said, as of my knowledge cutoff date, Test Drive Unlimited's online services were originally hosted by GameSpy, which has since shut down. However, the TDU community has developed a modification called "Project Paradise" that allows players to continue playing online.
Regarding your specific issue with your account, it's important to note that the availability and functionality of GameSpy and the associated online features may have changed since my last update. I recommend visiting the official forums or community websites dedicated to Test Drive Unlimited or Project Paradise for the most accurate and up-to-date information on how to create a profile and access online features.