Hi ,
Well, Emilly, this wouldn't be a Windows issue, but rather a console issue. Some users have reported the problem.
Try Settings - Power Options - see if the Sleep option is enabled - then Customize power options. - Uncheck "When console is off, turn off storage."
If that doesn't work, try contacting us.
Credits: https://www.reddit.com/r/xcloud/comments/1lleahk/broken_remote_play_black_screen/?tl=en-us
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Thanks