Xboxic has received an e-mail from one of their readers saying that Electronic Arts records gamertags and e-mail addresses for accessing their servers and this can cause a problem if you switch your gamertag to one previously used.
Geordon Stephen writes:
For all those who have changed their gamertag to one that was previously owned by another individual, you will have problems connecting to the EA servers and will most likely not be able to play any EA game online. I had recently changed my gamertag to one that was previously owned and was linked to another e-mail address, and this has in turn caused an error when trying to sign into the EA servers. Apparently they record any gamertag that attempts to sign into their servers and records which e-mail address that gamertag is linked to. The problem is, EA does not purge their records, and according to a technical support technician, they do not yet have the ability to do such a task. So if you switch your gamertag to one that had previously signed in while linked to another email address, then you will be unable to sign into any EA game for online play…this in-turn disables you from being able to obtain any achievements which require online connectivity.