Does anyone know why Edge/16.17025 wouldn't send referrers? Are there any registry keys or options to control this? There are meta tags on the page that have Referrer-Policy set to unsafe-url and Referrer set to always. The source and destination URLs are both HTTPS.
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It seems that <meta name="referrer-policy" …> has never been a standard nor a draft. So <meta name="referrer-policy" content="unsafe-url"> was presumably ignored by Microsoft Edge 16.
And regarding Referrer Policies, Can I Use reports that Microsoft Edge versions 12 to 18
initially supported an early draft of the specification which can only use a meta tag and is only compatible with the
originvalue from the new spec.
(emphasis mine), which implies that <meta name="referrer" content="always"> was also presumably ignored by Microsoft Edge 16.
In conclusion, Microsoft Edge 16 probably felt back to a default Referrer Policy that blocked referrer info. No idea of which setting you could have tweaked to counter this.