Connectivity with Nighthawk extender EX8000

Connectivity with Nighthawk extender EX8000
I just got my extender recently and it is connected to my home network, but when i put and ethernet cord from the extender to my xbox it doesnt work and is says Service info unavailable and NAT Type: Unavailable. Im using a CAT 8 bc i looked up to see if
using it eas fine and people said it was. Also i cant access my routers IP address it just says fe80: (...) and 10.0(...). I did that incase someone hacks me*

it also says when i check my NAT type, that my network isnt set up. Im confused

also i tried resetting all devices. Plz respond back and thank for your time.

xfinity

:)