Multiple Xbox One users have reported problems while attempting to sign in to their Xbox Live profile, just hours after the North American launch of the console's most anticipated title Titanfall.
Attempting to log in causes some users to receive error code 0x8004804E and an error message that reads: "There was a problem. We could not sign you in. Try again in a few minutes, or check your account by signing in to account.live.com."
The error prevents those affected from signing in to their Xbox Live gamertag, stopping them from heading online, playing multiplayer games and accessing their save files.
The problem first seemed to appear at around 7:30pm this evening and is not believed to affect Xbox 360.
Microsoft's Xbox Live support page states that there is currently a problem with players "joining other Xbox Live members in online games", but doesn't specifically acknowledge the sign-in error.
"Hi Xbox members, are you running into issues matchmaking in Titanfall or Forza 5?" reads the update. "We'll take it from here. Our team is currently working to get to the bottom of this. We appreciate your patience while we investigate. We'll update you again in 30 minutes."
It isn't clear how many people have been affected by the issue or when it will be resolved.
UPDATE - 21:01: Microsoft has formally acknowledged the problem, stating that it is "hard at work investigating this issue right now. Thanks for being patient while we work."
UPDATE 2 - 22:32: Xbox Support says that it can't provide an estimate for when normal service will resume, but that it is trying to resolve the issue as soon as possible. Apparently the problem "doesn't have anything to do with Titanfall".
UPDATE 3 - 12/03/14 08:57: Microsoft says that it has fixed the issue and that Xbox One users should be able to sign in to their Xbox Live profile as normal. If you're still having trouble signing in, Microsoft advises that you hard reset the console by holding down the power button for 8-10 seconds, then re-attempt to sign in.
It still isn't clear what led to the initial problem or how many users were affected.
Source: twitter.com, reddit.com, xbox.com, Xbox One