Had the same issue last night, was hoping i could sleep on it but still no dice, a world I had hosted all day long with multiple saves is no longer accessible with the same message, my friend can still access it but can’t reshare it with me? So now every time I want to access it he has to be online. I understand constant crashes and rendering issues on launch but not being able to access a map I’ve been grinding on for 2 days straight randomly out of nowhere is frustrating. (Xbox series x/s)