The Xbox 360 version never used “Live Access Codes” in the same way—it used a standard Xbox Live Gold subscription. Those servers were also shut down years ago. You cannot play UaW online on original Xbox 360 hardware today.
If you are searching for these codes today, you are likely looking for a way to bypass the now-defunct online authentication. This piece explains what those codes were, why they no longer work, and whether any form of online play survives. Universe At War Earth Assault Live Access Codes
. Instead, it became a cautionary tale of how DRM and platform-exclusivity can bury a masterpiece. The Innovation of Asymmetry The true brilliance of Universe at War The Xbox 360 version never used “Live Access
A: No. The multiplayer master servers are dead. You do not need a key to play via LAN or community VPNs like Radmin. If you are searching for these codes today,
Save this, and every time you launch a skirmish, you play a "Turbo" version of Earth Assault .