Hi KelvinA-Win7,
Thank you for posting in the Microsoft Community Forums.
I. Confirming Identity and Privileges
First, ensure that you are currently logged into the Microsoft account associated with the organization.
Since you are shown as an administrator, you should have sufficient permissions to perform subsequent actions. Note, however, that these actions may be irreversible, so use caution before proceeding.
II.Unassociating Azure Subscriptions from Organizations (if applicable)
If your Azure subscription is associated with the organization, you may need to unassociate it first. This can usually be done in the Azure Management Portal, and the exact steps may vary depending on the version of Azure and interface updates.
Before de-associating, make sure you have understood the associated billing and service implications.
III Deleting Azure AD tenants
Since you are the last administrator of the organization and cannot leave the organization, you may need to delete the entire Azure AD tenant. This is an important step because it will permanently remove all data and services associated with that tenant.
Before performing this action, be sure to back up all important data and notify all affected users.
The steps to delete an Azure AD tenant are as follows:
Log in to the Azure Management Portal.
Navigate to the “Azure Active Directory” service.
Select “Tenant Management” or a similar option in the left menu (the exact name may vary depending on the Azure version).
Locate the tenant associated with the organization you want to delete and select the Delete option.
You may be asked to confirm the deletion and enter some verification information. Follow the prompts to complete the operation.
Best regards
Neuvi