What it means
The store's website URL must be verified and claimed by an appropriate account user before the account can use it as expected.
How to fix it yourself
- In Merchant Center, open business information or the website setup section and confirm the exact domain/URL in use.
- Complete one of Google's offered verification methods, or verify ownership through an already connected eligible service.
- Claim the website in the account that should own it. Check whether another Merchant Center account currently has the claim.
- Recheck the status after verification propagates.
Based on Google’s help page: support.google.com/merchants/answer/176793. Google changes its rules from time to time, so check the issue’s own “Learn more” link in Merchant Center too.