Nighthawk EAX80 will not connect to NETGEAR_EXT network which does not appear on WiFi list. Did

You didn't give us a whole lot to go off. 

You have the EAX80?

What firmware is on it? 

What router are you connecting it to? 

Where exactly in the process is it going wrong? 

Did you try setting up using wps, using the installation assistant, both? 

Again, where does it fail in the process