Same issue. Reset Network Settings. Manually entered SSID. Restarted phone. Etc. No luck...anyone else with an update to this?
I just had this same issue when I did some stuff with my AP, and my wife and little bros phone were connected to wifi, my computer was, but My iPhone would not (I did have an issue that said no internet connectivity, so I forgot the network and tried to put my password in, it said incorrect)
I did everything said above but the one that did work was the inputting the wifi name and password as add a new network.
so far its working.