Streaming xFinity on SmartTV - Not on XFinity Network

I purchased a smart TV for a cabin that is on a non-xfinity network (Spectrum Charter).

I tried to get the xfinity streaming app to work. I would use the /authorize portal and connect the two successfully, but then would get a message saying that I could only access xfinity streaming on a mobile or laptop device and to exit the onscreen app on my smart TV.

Tried to ttroubleshoot with tech support and no can do. I ended up returning the TV. 

Has anyone had success wit streaming xfinity to a Smart TV that is NOT on an xfinity network?  If so, would love to learn more and if there are models/brands that this actually work with. It works just fine on my iPhone and Laptop. Dont see why a TV would be any different. 

Thanks!