netgear extender

I have an Xfinity gateway/router and I am trying to connect to my Netgear extender. When I press the WPS button on the Netgear, I get a blinking green light. Then I press the WPS button on the Xfinity router, I get a quick red light and back to the white light.

My wifi from router works fine. But it is not pairing with the extender or not even trying to pair with anything.

HELP!