Update: Xbox Live service has returned and is functioning normally.
The original story follows below.
Users attempting to sign into Xbox Live on the Xbox One may encounter difficulties, as the service is currently running in a limited capacity. Additionally, players trying to access Call of Duty: Advanced Warfare‘s Exo Zombies downloadable content may encounter an error which reads “A downloadable content package was removed or all profiles are signed out.”
To fix this, players need to download and install the free DLC “compatibility pack” by logging into Xbox Live, starting the game, and following the prompts. Players trying to do this via Xbox One may encounter difficulties as the service is currently down.
It is not known what is causing the service outage. In the past, an online hacking group claimed responsibility for attacking the network. GameSpot will continue to monitor this story as it develops. Check back later for updates on the service.