Minecraft "Unable to Connect to World" error - Mobile to Mobile (iOS) [duplicate]
Solution 1:
Looked at this post (on Arqade as well), and it seems like the issue might be with iOS permissions. In case the link breaks, go to the iPad settings app, go to Minecraft settings, and toggle "Local Network" to on. Also saw a Reddit post that had the same issue and solution. Seems to be because of the new iOS 14 privacy features.
Hope this works, and Happy Gaming.