Well, it seemed that was working. The last few days, it does not matter how or when we sign in, all progress is just gone. This is really disappointing. The only person who still has progress saved is the realm owner.
Shelly, it seems it is unable to add a player directly to the game, that is not previously signed in. If I push start to join and come into the game, it signs me in but does not sync.
If I use the xbox menu, sign in, then push start to join, it works. So, the sync issue is within the game. Hope this helps! It would be nice to see this fixed.
Still having same problem daily. Today, I've been trying to retrieve saved progress and inventory for the last 2 hours. Is anyone even gonna look at this?