@MojangSupport I really really want to play this with my daughter. On the same LAN, no firewall, an iOS version(connected to xboxlive) and a windows 10 version. Same 1.16.201. "Unable to connect to world". We can ping each other on the network, nothing is stopping us!
We apologize for the inconvenience, but this is currently a known issue. The team is currently working on a fix that should fix the issue as soon as possible. Thank you for your patience while we work on the solution!