A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
@frob-0826,
Permanently delete in the UI only applies to those sites that are not connected to the Microsoft 365 groups.
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Picture two:
If you want to permanently delete sites (including Microsoft 365 group-connected team sites), we suggest you use PowerShell, follow these steps:
- Download the latest SharePoint Online Management Shell.
- Connect to SharePoint as a global admin or SharePoint admin in Microsoft 365. To learn how, see Getting started with SharePoint Online Management Shell.
- Run the following command:
Remove-SPODeletedSite -Identity https://contoso.sharepoint.com/sites/sitetoremove
More information for your reference:
https://learn.microsoft.com/en-us/sharepoint/delete-site-collection#permanently-delete-a-site
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