Following a lengthy 20-page thread on the issue, Harmonix took to the Rock Band Forums to assure fans – and would-be track-suckers – that the feature would be back up and running soon. You see, the process for exporting tracks from Lego Rock Band is a little cumbersome: You enter the code included in the game onto RockBand.com which, in turn, provides you with a code to "purchase" the license from the Xbox Live Marketplace. At this point, you're able to actually download (it's not really an "export" at all) the tracks for the cool asking price of $10. The snag: Harmonix has "temporarily run out of Lego: Rock Band redemption tokens" but expects to remedy the situation "soon."
If you've already been afflicted by this issue, Harmonix has some advice for you in its statement. Everyone else, sit tight until whatever licensing nightmare that's responsible for this goes away. The statement:
Due to overwhelming demand, we've temporarily run out of Lego: Rock Band redemption tokens for Xbox 360. We're really happy so many of you were excited to bring songs from LRB over into Rock Band 3 and we're doing our best to get new tokens set up for redemption as quickly as possible. Stay tuned to this thread and watch @RockBand on twitter for updates. We'll be responding to everyone via Redemption@RockBand.com shortly, but HMXcj and I will be updating this thread to reach as many people as possible. Sorry again for the inconvenience and thanks for your patience![Thanks, Peter]