I am not sure if the two are linked, but I have been having problems with Minecraft Pocket Edition since my Xbox One was set up using the same account used of the aforementioned iPad Mini 4.  Since then, I have been unable to join multiplayer worlds, servers, and Realms.  I changed my password, am pretty sure I’m logged in, but still get the annoying “Your Microsoft account has been disconnected”.  My internet is fine, and I was able to play multiplayer before.  I don’t know if it has a link to the setup of my Xbox but considering the time-frame, it might.  The attached screenshot was taken from one of my many attempts to join a server.