A 403 Forbidden is returned by the website’s own server (Apache) and means the server understood the request but is refusing to serve the page. Since you’re seeing it only in Edge/Chrome but not in Firefox/Waterfox, that usually points to something specific to Chromium-based browsers.
To troubleshoot, try the site in InPrivate/Incognito first (this bypasses most extensions and uses a clean session), then disable extensions temporarily, and clear cookies/site data for that specific site.