On my MCPE app, people aren't able to join my world, but I'm able to join theirs, please help!!!?

I use Android, and I have an Xbox account, whenever someone tries to join my world it says they must sign into Xbox live, even though they already are

I use Android, and I have an Xbox account, whenever someone tries to join my world it says they must sign into Xbox live, even though they already are... please answer

or:I use Android, and I have an Xbox account, whenever someone tries to join my world it says they must sign into Xbox live, even though they already are... please answer

Tags:account,