For some languages, you might need to manually download a speech pack.
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Go to Start and open Settings .
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Select Time & language > Language.
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Select the language you want to add speech to, and then select the Next button.
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Select the speech options you want included with the language.
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Sign out and then sign back in for the new speech pack to be added to speech options.
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Go back to Settings > Time & language > Language, select your new language, and then use the up-arrow button to move it to the top of the list and make it the default.
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Go to Speech, and make sure the Speech language setting is aligned with the previous settings.
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Sign out and then sign back in for the new settings to take effect.