I traded my X1 to get the Forza 6 console, and went to play Horizon 2. Left it to sync for about an hour and it failed to sync. Kept pressing try again for an other hour and it never finished. So I selected play offline, which works for Master Chief Collection as it does actually sync when it says it failed. After doing that, it started a new game, and saved a fresh start save to my system.
I’m now trying to sync on my other console, but expecting the same outcome. I have around 90% completion in the game and if I lose my save, I’m not going to be happy at all. Especially after getting the Forza 6 console, plus buying the digital $100 version of the game, and spending money on all the other Forzas to get max rewards for Forza 6.
5 had this issue, which was two years ago now. Why hasn’t this been fixed? Its only the Forza series and MCC that fail to sync, which makes no sense since they are major first party games.
EDIT: Second system is doing the same thing. Gets to 80%, then slows incredibly taking another 5 min per % until 82% where it fails.