I couldn’t connect to my PC on my iPhone as well in the beginning. It just couldn’t find my PC whether via search or IP connect. But somehow I turned off both cellular and Wi-Fi, a permission dialog popped up.
Yes. I guess the reason it could work is that the app didn’t ask for “Wlan & Cellular” permission at first.
Anyway, this works fine for me. You can try it out and tell me if it works, iPhone users.