Update: It looks like after hours, service has been restored. Everything is working correctly.
It looks like Xbox Live is down at the moment. You can’t launch games as the console keeps on asking users to sign in as the person who purchased the title. We tested it on a few Xbox One devices and all of them experience the same issue. Apart from that, certain programs like Amazon Video fail to authenticate. However, according to the Xbox Live Status page and Xbox Support, there doesn’t seem to be any problem.
Websites like Down Detector are being flooded with complaints. Here’s hoping Microsoft releases that everything isn’t rosy at the moment and has engineers working on it as soon as possible. We just want to game on a Monday evening, is that too much to ask? We’ll keep you posted as soon as we know more.