For some time now it's not been possible to discover local wifi games - they simply do not show up, by contrast wired games are discovered just fine by all clients.

This has not been a problem untill the better together update as you could just add the local IP in the server tab and join that way.

But now that requires an Xbox live and permissions to join servers - please enable local adhoc games again.

This has been tested and confirmed on a two Ipad minis, 3 android phones and a android tablet.