The network used to sync Xbox Live and Gamertag Nation accounts appears to be Up at this moment.
Since the connection is up, gamertag information is being synced with Gamertag Nation accounts. Any games played using your Xbox Live gamertag will be synced to your Gamertag Nation account.
We know this may be your first time so don't hesitate to seek our support. You can start a thread in our official support forum or contact us should you need anything.