Just upgraded firmware to rev 1262, dated 1/9/19 on the Samsung website. Still no Xfinity App.
there is a whole separate thread about Samsung TVs at https://forums.xfinity.com/t5/Stream-TV-App/Xfinity-Stream-TV-app-on-Samsung-Smart-TVs/td-p/3138207 and you can check there if your model is valid for the stream app at this time.
closing this thread.
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