nighthawk axe7800 no connection solid amber

I’m pulling my hair. I have a fiber optic internet connection with no modem. Current router is a linksys router that is working ok but I was having some slower than expected speeds and bought the nighthawk router. When I connect the internet I just get a solid amber light on the internet connection. Everything else seems to work fine. The WiFi signal works. I can connect to it. But everytime I run setup on the app it just stops and tells me I don’t have an internet connection. I can plug it right back into my old router and everything works perfect. Just wondering if I should send the router back or could I possibly be missing a step