Global Admin Lockout

Question

Hello Microsoft Team,

I am the only Global Administrator of our Microsoft 365 Business tenant.

I am currently locked out of the tenant due to MFA authentication failure with error code AADSTS500121. I cannot access:

• Microsoft Entra Admin Center
• Microsoft 365 Admin Center
• Any administrative interface

There is no secondary Global Administrator in the tenant who can reset my MFA registration or restore access.

I have control of the company's verified domain and can provide proof of ownership if required.

Domain: [Moderator note: personal info removed]

The issue is preventing all administrative access to the tenant, and I need assistance with tenant access recovery for a locked-out sole Global Administrator.

Any guidance on the recovery process or escalation path would be greatly appreciated.

Thank you.

[Moderator note: personal info removed]

Answer 1

Please note that Q&A forum is a public platform, and moderators will modify the question to hide personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data.

Please note that this is the German (de-de) forum. I kindly recommend posting your question in German so that more community members can assist you effectively. If you prefer using English, you are welcome to post in the English forum instead https://learn.microsoft.com/en-us/answers/questions/. I sincerely appreciate your understanding and cooperation.

Hi tjcc281086 tjcc281086

Please note that we are not Microsoft support, and this is a user-to-user support forum. Moderators and contributors, including external Microsoft employees, do not have backend access and cannot directly intervene in Microsoft products or features. Our role is limited to providing technical guidance and best practice recommendations based on reported issues, requests, or ideas.   

In this situation, you’ll need to contact the Microsoft Support team directly by calling the phone number listed under Customer service phone numbers - Microsoft Support.  

An agent will be able to create a ticket for you under the affected tenant and then escalate this ticket to the Data Protection team, who can assist you in regaining access.   

Please note that an AI system may initially handle your call. I kindly recommend following the prompts carefully so you can be connected to a live support agent. 

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Alternatively, you can set up a Microsoft 365 Business Basic trial, which gives you the ability to submit a support ticket directly through the Microsoft Admin Center   

Step 1: Create a trial business account: Go to Microsoft 365 Business Plans and Pricing and click Try for free to set up a temporary Microsoft 365 tenant with a trial license.    

Step 2: Use this new account to sign in to the Microsoft 365 Admin Center and submit a support request on behalf of the affected tenant 

Step 3: Click Help & Support     

Note: This method doesn't require you to use your new account for your business. Instead, it allows you to create a temporary global administrator account so you can submit a support request. The trial account is free for one month. Be sure to cancel it after submitting your support request to avoid any automatic renewals or charges from Microsoft.  You may follow this guide for instructions: Cancel your Microsoft business subscription in the Microsoft 365 admin center | Microsoft Learn.     

I sincerely hope this information provides helpful direction and additional insight.

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