Minecraft "Unable to connect to world" on Wifi

I’m on vacation and part of the fun was supposed to be play minecraft with my son on our server. But whenever we attempt to connect we get the dreaded "Unable to connect to server message". We are playing Bedrock using ipads. Both iOs and mincraft are up to date. I have local network enabled in the settings. We are able to connect to the minecraft store and spend coins. And, there has been no other hints that anything else is blocked on the network. I managed to confirm that the issue is the wifi by signing in on my phone (sign in works on 4g, but not on wifi).

What could be preventing the connection? I might be able to talk the rental house owner into altering settings if I had a hit as to what the problem is.

Can anyone give any hints?