Xbox Streaming

Sorry, but it is not currently possible to upload console-streamed game videos. When you record a streamed game, the GameDVR video is associated with the Xbox app, not with the streamed game (because the recording feature doesn't know you are streaming or
what you are streaming). Consequently it cannot be uploaded (Xbox Live knows that the Xbox app is not a game).

Are you using the Xbox Console Companion on your PC trying to stream from Xbox or the Xbox Game Streaming (Preview)?

Try going to Device connections on your Xbox and make sure Xbox is able to connect.

Also check Allow Play To streaming and Allow game streaming to other devices.

System > Devices & streaming > Device connections

Are you trying to stream a game from Xbox 360 to Windows 10? That's not supported - the media center of old was for streaming videos and songs.

There is a way to stream Xbox 360 games to Windows 10, but it involved using an Xbox One and playing the backwards compatible Xbox 360 on the Xbox 360, then streaming the Xbox One to Windows 10.

Game streaming was mentioned in regards to the new platform Scarlett.

Xbox confirms streaming service

In what way do you mean?

Watch a stream while playing a game or stream the PC game you are playing?

If it's stream the game you are playing, no it's not possible. You can only use the Twitch app on the Xbox to stream Xbox console games.

To watch a stream on the console, it's easy, just launch the app, then log in, and find a stream you want to watch, then start a game on your PC.