Extender connected

Spectrum WiFi 6 Router  is the router I'm connected to, I try to use Nighthawk to access status, no luck, can't log in, try my Network name and password, no luck, try admin and password, no luck, go to forget password and site that comes up does not go to reset password, when I go to " my wi fi net." no spaces, it tells me I'm not connected to a extender. So I need to log into my router a see if it shows attached devices, the network has same name as extender from "one name" setup so will it show me extender as device?  I will try it a let you all know, Thanks