When I join my world (with multiplayer activated) I look at the settings and it says that multiplayer game is off. None of my friends can join. I tried making a new world in which I activated this setting but it still doesn't work. This only happened after installing the Nether update.
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I had it on, thanks for your help!

We're tracking this issue at MCPE-44422, so I will resolve and link this ticket as a duplicate.
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Do you have cellular data on?