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Why is it that not all Sony Bravia android TV's support Alexa control,
Support for the Sony ATV1 platform (2015 and early 2016 models) is slowly ceasing now. This most probably also means that you won't receive the Oreo update.
For readers interested in extensive information concerning Sony Bravia Android TV’s support for Alexa, including supported TV models, TV functions and requirements we suggest reading this article.
As of the moment Amazon supports Alexa Skills only on UK models. Also be aware that most TV functions if not even more TV functions are directly supported by the latest update of Google Assistant on your Sony Android TV. (e.g. “fast forward 25 seconds” while watching a YouTube video)
Alexa also works in Austria/Germany.
Thanks for the clarification. I have edited my post clarifying the reference to Alexa Skills.