A few day's before 1.19 (v1.18.30) came out my freind and I were playing on a server (Note: He plays on a switch) We decided to go on my world but he couldn't join. Even though my Microsoft account was connected and I was friends with him. And my friend told me to go on his world after 1.19 but it there were no worlds to join even though he was playing Minecraft and he was on that world.