He was using mobile data while playing Minecraft(PE) and whenever he tries to join/connect with my world, it says “unable to connect.” When he connects to the server he can enter, but he can’t join to his friend’s world like mines.

He tried using his mobile data as his hotspot and played Minecraft on another device. I tried entering his world, but it says “unable to connect world.” Then when he tried entering my world, it displays as “unable to connect world.”