I'm also really disappointed that this is not available. As per usual, they are trying to do their own thing.
" Comcast has revealed no plans to support Apple TV’s new single sign-on feature and instead told FierceCable that it will continue to work with tech companies Adobe and Synacor, and industry group CTAM, to develop a universal authentication scheme."
Whatever - my comcast contract is up soon, and I can get fiber internet and single sign on from centurylink...
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