Cortana, windows 10, Language or Locale not supported.

So your language and locale are set to one of the supported languages/locales but Cortana refuses to allow you to switch it on with a ‘language or locale not supported’ message.

You upgraded right?

Bad news: you need to do a clean install of windows 10.

Good news: Cortana will now work properly.

Oh, and make sure your language and locale match.

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