How to link your Xbox account to an Xbox One controller

[Windows Central]

Here's how to use the Xbox One's new personalized sign-in option, known as controller linking.
Ahead of the public rollout of the Xbox One's Fall Creators Update later this year, Microsoft has begun testing some of the forthcoming features through members of the Xbox Insider Program. Among these additions is support for Mixer's new co-streaming functionality and a somewhat overlooked feature known as "controller linking."

Full story from the WindowsCentral blog...