Why are some local and national news channels streaming video blocked by xfinity or comcast? I have attempted to access internet streamed news via Amzon Fire. I already pay the programming as part of a Comcast home service package deal Yet when I attempt to unlock the streaming service via Amzon Fire I am informed by the app that the ISP has blocked access.
Comcast/XFINITY would need to have agreements in order for the companies to provide the third-party subscription authentication.
The How to Access Network Websites and Apps website is somewhat helpful, but networks and applications can vary per device. Such as authentication is supported through Roku, but no Android TV or Amazon Fire OS. Kind of something you would need to play around with and find something that works best for you.