Same here bought a new xbox one x so I could put my xbox one s in the living room after my kids xbox one s died but now I can't play my game anymore after playing 48+hrs.... all other games and apps synced up just fine...
same problem bought a new Xbox one x but the game will not sync with the save on my Xbox one s..... very frustrated... just spent an additional $100 on and ex hard drive and a new router but it did not help