I recently got myself an Xbox Series S at my local game store and when I got home, plugged in my Xbox HDD. Started Halo 5 up, and got into a Slayer match. The game completely looks the same as the Xbox One, One S versions of the game instead of the One X enhanced version. Am I missing something or doing something wrong here? It’d be nice to get some clarification about this topic.
Maybe try redownloading the game from the Store and use the internal storage? See if that makes a difference.
The Series S does not run One X enhancements.