Call of Duty: Black Ops 3 officially launced today (midnight release), and it looks like there's a small hiccup with the Xbox One version.
Activision has confirmed player reports that the Nuk3town multiplayer map, available as a pre-order bonus, as well as The Giant Zombies mode map, a remake of Treyarch's classic "Der Riese" Zombies map, are both unavailable on Xbox One.
"We have received reports that players are unable to access both The Giant and Nuk3town maps on the Xbox One," Activision acknowledged. "We are currently aware of this issue and we are looking into it."
While no further update has been offered as of yet, Activision suggests restarting your console if you encounter the problem as this "may resolve the issue."