iPhone 6S WiFi Issues

I have a iPhone 7, iPhone 6S, Amazon Fire HD and an Android TV box. Both iPhones have the latest iOS. At my present location, I only have connection problems with the 6S. Every other item connects perfectly. The 6S says “Incorrect password “ or won’t even pick up the SSID. I go to my work location and it works fine.

I’ve done the hard reset, network reset, etc. to no avail. There is nothing wrong with the router because everything one else connects just fine. I’m about 10ft from the router, distance doesn’t matter.

I assume that Apple is working diligently on this widespread problem, according to all of the posts i’ve seen this is a big issue. They want to keep their long term users Happy.