I seem to be having the same issue, did you delete the seo app and get a new one or did you ask them to remove the extra brand?
I only suspected it after seeing another poster with the same problem and a Shopify Expert chimed in that it was the SEO app. I tried it and it was the reason all these years I was having an issue.
I faced the same issue. But when I uninstalled the "Strong SEO" app. The "duplicate brand" issue has started to be resolved. It has validated 7 out of 14 items so far. The remaining ones are being processed.
It's Lee from Strong SEO here. Sorry about the issue you had with this error. You're right that our app previously may have caused this issue.
Good news! There's no longer a need to uninstall Strong SEO. We have added a feature to prevent duplicate fields and the details are on our website here: https://strongseo.app/duplicate-field-brand/
All the best with your store 🙂
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