I can't connect to my friends' world on Minecraft Pocket Edition version 0.15.3. I can see their name pop up, I press it and it tries to load. Then it says: you need to authenticate to XBox Live. Please help!
Get Xbox app installed and log in the Minecraft then log in the Xbox app. I think this should remove the authentication problem. If you don't have an account then sign up. In the realms option you see "sign in" tap it. I assume that you already have email registered in your phone . Use that and sign up
How to connect in Minecraft:
Turn on Hotspot on the host.
Connect a second phone to the other phone.
Open world (1st phone)
connect to world on second phone(right tab)