I experienced the same issue last night. I used to be able to Cast/Mirror Live TV from the Xfinity TV App on my Android phone to my Sony Android TV. Now, I can't. I can tell you that this is NOT an Android issue. When this failed, I had a friend of mine who was over log into their DirectTV app, which has similar functionality, and it cast to the AndroidTV just fine. This definitely a Comcast restriction. I need this functionality because my TiVo broke and my replacement won't arrive for about a week.
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