Microsoft has removed native Mixer streaming from Windows 10
Mixer goes byebye with the most recent update to the Xbox Game Bar.
When Microsoft originally purchased Mixer (then, Beam), it very quickly integrated the streaming service directly into Windows 10, allowing users to begin streaming at the touch of a button (or, well, a key combo). Moving forward, that will no longer be the case.
Microsoft began working on a sweeping revamp of its Game Bar features for Windows 10, spinning it out to a separate app, and iterating updates based on user feedback. With the most recent update, Microsoft added an FPS counter to games and an achievement overlay. However, it also removed a fairly major feature.
Mixer broadcasting direct from Windows 10 via the Game Bar is no longer supported. Instead, Microsoft advises users to opt for a tool like OBS, StreamLabs OBS, or XSplit, which the vast majority of Mixer streamers probably do already anyway.
A Microsoft spokesperson provided this comment to Windows Central on the matter.
Microsoft also quietly pruned the Xbox Tournament features from the OS recently, as well, perhaps as part of a wider effort to cull underused gaming features across the board. Either way, XSplit or OBS provides a far more feature-filled streaming experience than the Xbox Game Bar ever did for Mixer, so it's unlikely very many people were actively using it.
Related: How to use the Windows 10 Xbox Game Bar
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Jez Corden a Managing Editor at Windows Central, focusing primarily on all things Xbox and gaming. Jez is known for breaking exclusive news and analysis as relates to the Microsoft ecosystem while being powered by caffeine. Follow on Twitter @JezCorden and listen to his Xbox Two podcast, all about, you guessed it, Xbox!