[MCPE-102596] Cannot connect to LAN worlds on any iOS devices, but can connect to remote friends

Update on this issue:

Many users have found that the issue they have is that Minecraft does not have the correct app permissions enabled on their device. The following steps might resolve the issue for you:

Open the main Settings on your iOS device
Scroll down and select the Minecraft app
Ensure the "Local Network" toggle is ON

Useful comments with the workaround can be found here and here.

My kids and I used to be able to connect to each other's worlds at home on wifi. They then signed up for Microsoft accounts so They could connect to friends who were not in our house. Everything continued to work fine. Then a couple weeks ago, they could no longer connect to any local network devices, but still could connect to friends in other locations. Our devices are all updated. We have no idea what the issue is. Nothing has changed in our settings or services. We all connect using the same wifi network, same app versions, etc. We don't use any mods, and are not using beta versions of the game or any kind of extra security or firewalls.