Amazon debuts single sign-on for Fire TV with support for Spectrum, DirecTV, Dish, Optimum, Verizon FiOS, and others; Comcast Xfinity not supported (Chris Welch/The Verge)

Chris Welch / The Verge:
Amazon debuts single sign-on for Fire TV with support for Spectrum, DirecTV, Dish, Optimum, Verizon FiOS, and others; Comcast Xfinity not supported  —  Amazon joins Apple in offering Single Sign-On, but Roku still doesn't have it  —  Amazon is eliminating the frustration of having …

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