In this blog you will see how to remove the deleted site collection permanently from SharePoint Online recycle bin using Powershell.
Syntax:
Connect-SPOService -Url https://c986-admin.sharepoint.com/ -credential [email protected]
Remove-SPODeletedSite -Identity https://c986.sharepoint.com/sites/vijaitestsite
Output:
Removes the deleted site collection from SharePoint Online recycle bin permanently.