Update: Microsoft says it has deployed a fix, although some users are still reporting issues. Try to hard reset your Xbox (hold power button for 5 seconds, then turn it back on), as some reports suggest this may be a temporary workaround.
Nope, it’s not just you. Xbox Live appears to be down for some users, preventing online sign-ins to Xbox One consoles and other services that require Xbox Live. The outage was reported earlier today, but recently the status has been updated to say “resolution pending,” suggesting the problems will soon go away.
Xbox Live experiences outages from time to time, but they never last particularly long. Hopefully, Microsoft can get it back up and running sooner, rather than later. We’ll update this post to let you know when it’s back up.