Multiplier/Join Game isn't working for me and my friends.

What I expected to happen was...:
Me and my friend to able to play multiplayer and we both have kindle fires.

What actually happened was...:
Describe what happened here; it didn't work and we even tried to go on other worlds together.

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here; Open Minecraft PE
2. ... Make sure your friend is on a world
3. ... press Join Game and it doen't work