NightHawk X4 AC2200 WiFi Range Extender Model EX7300 Finally got it working. Finally!
I received the refurbished AC2200 after Amazon Prime Day, great price on both the C7100 and the AC2200.
I tried for several hours using my Samsung G& to activate and connect the AC2200 .
I could NOT get to broadcast or connect properly.
Today I used my Dell desktop and followed the mywifiext.net selection for Windows.
I had also used the factory reset last night, before using my desktop to go through the setup and connection and everything worked.
I'm not sure if it was the factory reset or the desktop connection, but now I am a happy camper.