Xfinity Stream app on Roku says it can only be used in home - but we are at home!

Just set up a Roku with the Xfinity Stream app, and I go to start it, but it says we are not on our in-home wifi.

Its a new home and all the cable runs aren't working yet, but really need to get this TV going.  Any idea why Xfinity doesn't see its own service?