The issue here is that licensing agreements restricts streaming of content from Xfinity TV outside the US. Actually the website does not make this very clear. Normally when you try to watch videos on a site only available in the US you will get a clear explanation. On the Xfinity website you will only get a message saying “Sorry, this video is unavailable” no matter which video you try.
Behind the scenes the Xfinity TV website has detected your location via your computers IP-address, which is a easily identifiable number that you get from your Internet Provider when you go online.
So in order to avoid the above error message from Xfinity TV website you need to connect via an American IP-address.
This is not something you can just grab of the shelf in the supermarket, but it is close.
Faking Your Location With the Help of VPN
Since location detection is done via your computers IP-address this is all you need to change in order to make Xfinity think you are located in the US.
By connecting to a Virtual Private Network with a server in the US you can inherit an American IP-address.