A Eurogamer analyst has reported that Red Dead Redemption 2, a fresh release from RockStar Games, seems to have failed his test for high dynamic range (HDR) support while running on the XBox One. If these results are valid, the game only offers an upscaled form of standard DR (SDR).
https://www.notebookcheck.net/Red-Dead-Redemption-2-appears-not-to-support-HDR-on-XBox-One.354026.0.html