I've been experiencing this problem which prevents me from play all my games on xbo one recently and I'm at a complete lost as of what to do. I've been getting " Data couldn't be synced" message for the past few days. I've tried everything you could think of including clearing cache, removing profile and redowloading it, I've even done numerous full system restore on the console itself and still nothing. I've called Xbox a few times now but they can't seem to help me either. I honestly at this point don't know what else to do as of right now. It funny because I get this message for playing games I have never yet played so it has to be something up with the cloud save feature that preventing me from playing games. The only game I can play online is GTA 5 for some reason, and that's if start the game up offline then go online. If anyone has a solution to this problem it would be deeply apriciated.