Cannot connect to friend's world / Stuck on "Locating server" screen - Xbox version

I'm trying to join my friend's world but nothing seems to work, it gets stuck on the loading screen "location server" when I join. We both have the latest version of Minecraft, I also tried reinstalling the game but still nothing. Whenever my friend or I create a new world, we have no problem joining it but I cannot join this one world in particular. I was able to join that specific world 2 days ago but not anymore, got any advice?

 

Thanks!