Submit a request for OTS to delete a SharePoint/Teams site. The request must include the site URL including the site name (i.e. https://ubalt.sharepoint.com/sites/[sitename]).
Site deletion deletes the SharePoint/Teams site, it's associated Microsoft 365 group, and all its resources, including the Outlook mailbox if it has one, calendar, and any Teams channels, files, messages and other content. Site deletions should be considered final.