Your canonical tag is a suggestion, and it loses arguments

Your canonical tag is a suggestion, and it loses arguments
People treat canonical as a command. It is one signal among several, and when the other signals disagree, it loses.
Signals that fight your canonical:
— Internal links. If the whole site links to the variant instead of the canonical, you have voted against yourself.
— Sitemaps listing the non-canonical version.
— Redirects pointing the other way.
— Pages declaring each other canonical in a loop.
— A canonical target that redirects, errors, or is blocked from crawling.
— Content that is not actually equivalent. Canonical is for duplicates, not for "sort of related".
How to check: inspect the address and see which version is genuinely treated as canonical. If it is not yours, stop adjusting the tag and start fixing the links.
Consistency across every signal beats a perfect tag standing alone.

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