1.Connect Sharepoint Online via SPO Service
Connect-SPOService -Url https://TenantName-admin.sharepoint.com/
Example:
Go to your Sharepoint Admin center and copy URL
Connect-SPOService -Url https://LiveSolution-admin.sharepoint.com/
2. Enter Login Credentials.
3.Execute this command and Enter Y
Remove-SPODeletedSite -Identity https://LiveSolution.sharepoint.com/sites/Testing
Site will be removed immediately from Recycle Bin.
