Multiplayer not working

I made sure all my settings were correct, I had use data turned on and everything, and when I'm on the world settings multiplayer is turned on and everything is fine, but as soon as I open any word and playing on one, it automatically switches multiplayer off and I am unable to invite people and they are unable to join me and don't see when I am playing, and when I close the world again, multiplayer is back on. Does anyone know why this is or how it can be fixed?