Yes, you can: How to play Xbox 360 games on Xbox One – GeekWire
PlayStation 4 will work with Xbox One's HDMI pass-through port - GameSpot
Xbox Audio Passthrough | Xbox Support
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Xbox Series X HDMI pass-through currently not supported | TweakTown
Can You Play Your PlayStation 4 via the Xbox One's HDMI Pass-through? | PCMag
Next Xbox rumors point to HDMI passthrough and cable TV integration
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How to Use the Xbox One's HDMI In Passthrough Port to Plug in Other Consoles – GameSpew
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Xbox Series X HDMI pass-through currently not supported | TweakTown
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Microsoft confirms that PS4, Wii U will work with Xbox One HDMI passthrough - ExtremeTech
Xbox One HDMI Passthrough w/ Nintendo Switch: Tip of the Week - YouTube
Xbox Audio Passthrough | Xbox Support
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No, the Xbox One S doesn't support 4K pass-through | What Hi-Fi?
Xbox head on why Xbox Series X removes HDMI-in and optical audio | Windows Central
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/cdn.vox-cdn.com/uploads/chorus_image/image/61158847/xbox_one_10.0.1473264862.0.jpg "Xbox One uses HDMI output, doesn't support component connections - Polygon")
Xbox One uses HDMI output, doesn't support component connections - Polygon
How Useful Have You Found The 'HDMI In' Port On Your Xbox One? - Talking Point - Xbox News
Microsoft: Yes, you CAN plug a PS4 into the Xbox One, but please don't
