EXT:seo, Side Properties and Detail Extension
Compare a normal page to an Extension detail view. If the output is only missing there, the responsibility may lie with the integration of the detail extension.
Open the dataset of the affected page and compare a set canonical override with the site base and the real language URL. In the case of a news or product detail page, you also check whether the extension brings in its own canonical source. A fixed target fluid snippet shall not double the dynamic assignment.
Where to check the setting in TYPO3
In TYPO3 13.4, control the SEO page properties and output of EXT:seo. For detailed pages, you also check the CanonicalGenerator or adjustments to the extension. Do the site’s basic URL and language configuration match the published target?
Example of this specific finding
Illustrative control case: An article page and its tracking variant provide the same text, but not a preferred URL. The variants must first be compared in terms of content.
<!-- Auf Artikel und identischer Trackingvariante -->
<link rel="canonical" href="https://example.org/ratgeber/bremsen/">follow-up audit in TYPO3
Get a default page and a detailed view of the same site. If the finding occurs only in the detailed view, first examine its output instead of the global site configuration.
For these identical variants, consistently specify the clean article URL. Internal links and sitemap should give the same address.
Derogations and scope
A unique page without a canonical is not automatically unindexable. Even an existing canonical does not guarantee the selection by Google.
Reference: TYPO3 13.4 with EXT:seo. For other major versions and own extensions, responsibilities may differ; check the actually installed output.
Classify the general error
Definition, system-independent causes and further correction examples: A missing canonical is not a blanket indexing error