No canonical URL tag in server HTML

A canonical URL is a tag in your page's code that tells search engines which is the "official" version of a page, preventing duplicate content issues when the same page can be reached via multiple addresses (for example, with and without tracking parameters). This tag was not found in your server-delivered HTML. (If your site is a single-page app, the tag may be added by JavaScript after load — worth confirming.) Without a canonical tag, search engines may treat URL variations — such as pages with campaign tracking codes appended — as separate duplicate pages, splitting your search ranking signals across multiple versions. Ensure a canonical link tag is included in the server-delivered HTML of every page, pointing to the preferred URL for that page. Your developer or CMS settings can usually apply this automatically.