Xbox Live is Down on Xbox One and Xbox 360 [UPDATE]
UPDATE: All Xbox Live services have been restored.
Good news, everyone! The issues previously listed in our last few posts have now been mitigated, so feel free to give those another try. Thank you for reporting the issue, we’re here and we’re listening. https://t.co/LofAusFNrR — Xbox Support (@XboxSupport) January 12, 2019
The original story follows.