Hi @George Siomos_old To delete an Azure AD tenant, you need to be a global administrator for your organization. If you're not able to access the Azure AD tenant, you can try the following steps:
- Sign in to the Microsoft 365 admin center with an account that is a global administrator in your organization.
- Preview the new Microsoft 365 admin center by turning on the Try the new admin center toggle.
- Select Azure Active Directory.
- On a tenant's Overview page, select Manage tenants.
- Select the checkbox for the tenant that you want to delete, and then select Delete.
- If your organization doesn't pass one or more checks, you'll get a link to more information on how to pass. After you pass all checks, select Delete to complete the process.
Please let me know if you have any questions and I can help you further. If this answer helps you please mark it as "Verified" so other users can reference it. Thank you, James