Note: the article below is for on-prem SharePoint. For Microsoft 365 orphan/ownerless resources – sites, groups – please check 
– Ownerless Microsoft 365 groups, teams and sites Q&As 
– Microsoft 365 ownerless groups policy email template format and content
– Orphan Microsoft 365 groups in large environments

Remove orphan sites from SharePoint content database

Problem: When you patch SharePoint or perform database-attach migration or just do Test-SPContentDatabase, sometimes you can see errors with category “SiteOrphan”. Although it says “UpgradeBlocking : False”, Ignoring this error may cause severe issues, even data loss.
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