https://wccftech.com/death-stranding-is-unavailable-in-the-xbox-version-of-geforce-now/

The title doesn't lie, the Xbox version of GeForce NOW has blocked access to the game published by Sony. Well, technically it's not an actual Xbox version but rather running the service through Microsoft Edge on Xbox. Death Stranding is currently unable to be launched through Xbox's version of GeForce NOW, it won't even appear on search results.

Tom Warren, a journalist from The Verge, noticed this issue when trying to search for Death Stranding on Xbox's browser. The game doesn't show up in the service's directory even if you type in the entire title, even though you can run it on PC. Even when the journalist tried to copy the link to this title found on the PC, he couldn't get the game to run.