We're unable to detect your in-home XFINITY network

When I go to this page https://xtv.comcast.net I get this message. 

We're unable to detect your in-home XFINITY network

First time using XFINITY TV or X1 DVR on this device? You must be on your in-home XFINITY network.

I am on my home Network, I even have the X1 box plugged into my switch. It is on my network.

The app produces the same message.

I do not have the XFINITY Wireless Modem ( it was inadequate) I am currently using a Motorola SB Modem with a Netgear and a  Dlink as an extender.

I  also attmepted to connect this  when I had the XFINITY Wireless Modem (for those few days).. still the same message. We're unable to detect your in-home XFINITY network

I live in SW Florida,  I assume the service is available here?

Thank You