Step 2: Deleting the tenant
Authenticating with Azure Active Directory on powershell
AzureAD-Commands
a) connect-AzureAD -tenantid <your-tenant-id>
Azure Active Directory --> Properties --> Directory ID
b) Get-AzureADApplication
--> (+)
For every Application:
Remove-AzureADApplication -objectid <your-application-id>
--> (+)
then:
Remove-AzureADServicePrincipal -ObjectId <your-enterprise-application-id>
Azure Active Directory --> Delete Directory --> Exterprise Applications
For every Exterprise Applications:
Click on row --> copy Object ID = <your-enterprise-application-id>
c) In my case i was able to delete the directories (tenants) after a) and b)