Not able to watch all channels - XFinity

Why is it that when I want to use my tablet to watch sports events such as NFL it tells me I can only watch at home? I only try to watch channels that I am receiving at my home when using my tablet. Example: I get ESPN at home and I am able to watch Monday Night Football. I was away from home Monday night and was going to watch the game on my tablet, but it said that I could not watch it. If I have the channel on my home system, why can't I watch it on my table from anywhere?

This question, "Not able to watch all channels," is about XFinity-Comcast TV Television Apps.

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