UPDATE 00:28 GMT: Xbox Support says that users should be able to sign into Xbox Live again.
Users should now be able to sign in to Xbox Live again. We appreciate your reports, we're here & we're listening. https://t.co/RCBWO5bgPE
— Xbox Support (@XboxSupport) March 13, 2020
However, the service may not be entirely back to its normal self, as Twitter users are now reporting that party chat and friends lists are broken.
Meanwhile, the Xbox Live Status page states that all services are back up and running aside from Rocket League on Xbox One, which is experiencing an undefined issue.
If you’re currently experiencing issues with Xbox Live, don’t worry – you’re not alone. The service is currently undergoing some outages that are affecting login attempts, in-game servers, and purchases.
As per the Xbox Live Status page, those attempting to sign into Xbox Live on Windows 10, the official Xbox website, any Xbox 360 consoles, and any Xbox One consoles may find themselves unable to do so.
Xbox One players may also find themselves unable to buy downloadable items or use prepaid cards or codes for downloadable items or Xbox Live subscriptions. It appears that the purchasing issue isn’t affecting any other platforms.
While the status page states that those are the only two affected areas, many users on Twitter are reporting that they’re incapable of logging into games such as Fortnite and Rainbow Six Siege.
Xbox Support says it’s aware of the issues and that the teams are looking into it.
We're aware that users are seeing issues signing into Xbox Live services. Our teams are looking into this issue. We will update you here but in the meantime, you can find updates on our status page. https://t.co/dG2dbISiH7
— Xbox Support (@XboxSupport) March 12, 2020
You can keep an eye on the server status for yourself by following the link here.