I need to debug an HTML app on ipad. I used to be able to connect ipad by USB cable to my mac and it would show in the \"Develop\" menu in Safari. I have two ipads now - one w
One more tip to try - after trying many of the above suggestions I turned off "Sync with this iPhone over Wi-Fi" in iTunes.
Voila! Got my iPhone into the Develop menu!
(for context, this is in Mojave 10.14.6, iOS 13.1.3, Safari 13.0.3)