Well, according to this page
https://httpd.apache.org/docs/2.4/mo...uthn_core.html
Quote:
The string provided for the AuthName is what will appear in the password dialog provided by most browsers.
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Note the word 'most' in that text; maybe try a few different ones?
Also, can you get to it without going through Cloudflare (or anything else) ie check if the Authname string is being transmitted at all?
Maybe use 'Show Page source' option in your browser and/or 'Web Developer tools' or similar?
firefox has bunch of stuff built-in; see Tools menu.