Microsoft is currently experiencing an outage where some users are unable to login to Xbox Live, access their saved games, or have issues with matchmaking. Microsoft has confirmed these issues in the Xbox Support Twitter account. At approximately 7:30 PM EST, service was restored for both Xbox Live and support.xbox.com at approximately 8:30 p.m. EST. Service has since been restored to both the Xbox Live service and the support.com service for the site has been restored.
Source: https://www.bleepingcomputer.com/news/microsoft/xbox-live-and-supportxboxcom-experiencing-an-outage/