Currently there is no way to watch uverse through an Apple TV. Closest option is to watch on your iPad or iPhone and then screen mirror to the Apple TV.
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We found out only certain (most) U-verse channels can be mirrored using Apple TV. Any premium channels you pay for, you have to download that app using your Apple TV menu. Like HBO, Showtime, etc. Local channels might not work either, like ABC, NBC, CBS.