Hi Srabon Ahmed.

您可以通过访问
Office 365 Security& amp;来确定谁删除了SharePoint Online网站集。合规中心（https://protection.office.com），然后转到搜索&中的
审核日志搜索调查。

您可以通过执行来自SharePoint Online Management Shell的
Get-SPODeletedSite cdmlet。

You can determine who has removed a SharePoint Online site collection by accessing the Office 365 Security & Compliance Center (https://protection.office.com), then going to Audit log search under Search & investigation.
You can determine when the site collection was removed by executing the Get-SPODeletedSite cdmlet from the SharePoint Online Management Shell.

再见。