Checklist. Using Danish as an example.
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Make sure to clearly set the domain in UTF8 in the source code:
<base href="https://æøå.example.com/"/>
<link href="https://æøå.example.com/" rel="canonical"/>
<link rel="alternate" href="https://æøå.example.com/" hreflang="da-DK"/>
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Explicitly set the language:
<html lang="da-DK">
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Provide the readable site name for the search engines and sharing snippets: