Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Dear Nick,
Thank you for clarifying, and I appreciate the honesty. That actually explains things nicely, and it is a more common situation than you might expect. Plenty of people have set up a tenant for a specific purpose and then found themselves locked out of their own "organisation" later.
So to confirm: you are the sole Global Administrator of the tenant, there are no alternative sign-in methods registered, and no one else can reset it for you.
I genuinely wish I could reset the Authenticator registration or cancel the subscription for you directly. Unfortunately, as a forum moderator, I cannot access tenants, authentication methods, or billing records. You will need to contact the Microsoft Data Protection team, as they have the tools to verify your identity and help you regain access. For business accounts, the best way to reach them is by phone. You can refer to this article to see the customer support phone number for your region.
Customer service phone numbers - Microsoft Support
Here are some tips and a sample response to help you navigate the Interactive Voice Response (IVR) system more effectively:
In some countries the call is handled by an automated system, which tends to cut people off if the answers do not match what it expects. Here is a flow that generally works better:
IVR: What kind of problem do you have?
You: Account recovery.
IVR: What kind of product do you use?
You: Office 365 for business.
IVR confirmation: education or business account?
You: For Business
IVR: Are you an administrator?
You: Yes.
IVR: Is there another administrator in your organization?
You: No.
IVR: Do you need a... service request?
You: Yes, please connect me with the Data Protection team.
Kindly note that you may need to repeat this process a few times, availability can vary based on local business hours, and the term "Global Admin" should be clearly mentioned during the call.
Alternatively, if reaching support by phone is not possible, you can also create a free trial tenant and submit your request from there. To set up a new tenant, follow these steps:
Visit the Office 365 Enterprise plan and pricing comparison page, choose Basic plan, and click "Try for free" to start a free trial.
Follow the guided setup process to create your new trial account.
Once the new tenant is created, you should be able to access your support portal and submit your ticket.
Sign in to the Microsoft 365 admin center
Go to Show All > Support > New Service Request.
In the request, explain your situation in detail.
The support team will guide you through the identity verification process to help you regain access to your account.
Important Notes:
This new test tenant doesn't give you access to your original locked tenant's data or settings. It only serves as a temporary means of contacting Microsoft support.
Be prepared for Microsoft to want to verify your identity and admin privileges from the previous tenant.
The processing time may be longer due to contacting support from another tenant.
Remember to cancel the trial subscription as soon as your original account is restored to avoid unwanted charges. You can do this in the Microsoft 365 admin center, under Billing > Your products.
For reference: Cancel your Microsoft business subscription in the Microsoft 365 admin center | Microsoft Learn
I truly hope you get this resolved swiftly. Please know that even though I cannot directly intervene, pointing you toward the correct, specialized support is genuinely the most effective help I can offer from my position. Please let me know if you need anything else. Wishing you all the best.