How to delete a team project from Team Foundation Service (tfs.visualstudio.com)

C:\project>tfsdeleteproject /collection:https://buckh-test2.visualstudio.com/DefaultCollection Testing

Warning: Deleting a team project is an irrecoverable operation. All version control, work item tracking and Team Foundation build data will be destroyed from the system. The only way to recover this data is by restoring a stored backup of the databases. Are you sure you want to delete the team project and all of its data (Y/N)?y

Deleting from Build ...
Done
Deleting from Version Control ...
Done
Deleting from Work Item Tracking ...
Done
Deleting from TestManagement ...
Done
Deleting from LabManagement ...
Done
Deleting from ProjectServer ...
Done
Warning. Did not find Report Server service.
Warning. Did not find SharePoint site service.
Deleting from Team Foundation Core ...
Done