Here is process how to remove office 365 groups or soft deleted groups from your office 365 tenant.
you need to connect with Azure AD via using PowerShell
Make sure AzureAD module will be Updated
Output like this.
Copy the ID of Group & run command like below.
Remove-AzureADMSDeletedDirectoryObject –Id e0fcb368-ad55-4a9e-8f44-95fb2634f2f8
Office 365 Group is removed from your office 365 tenant.
Feel free to comment below.