Canonical points to an error page

CriticalNeeds reviewCanonicalizationPer-page checkindex_canonical_to_error

What this means

The rel=canonical target returns a 4xx or 5xx. The page is nominating a URL that does not exist as its indexable identity, so the canonical signal is discarded and the page risks being dropped or consolidated against an unrelated URL.

How to fix it

Repoint the canonical at a working 200 URL — usually the page's own address — or restore the target URL if it was removed by mistake.

Fix effort

This check needs review: the change can be drafted for you, but a person has to approve the wording or choose the target before it ships.

Authoritative source

https://developers.google.com/search/docs/crawling-indexing/consolidate-duplicate-urls

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