Your canonical tag issue usually happens when pages point to the wrong canonical URL or duplicate pages exist. To fix it:
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Check canonical tags on affected pages — make sure each page points to its own URL (self-referencing) unless it’s a true duplicate.
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Remove duplicates or fix redirects so Google sees one version of each page.
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Update your sitemap with only correct URLs.
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Resubmit in Google Search Console → “Validate Fix” after corrections.
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Use Shopify’s SEO settings:
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Online Store → Preferences → check “Search engine listing preview”
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Ensure canonical URLs match the live page URL.
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