Request for Admin Access Recovery – Microsoft 365 Error 500121

Dear @MUHARMAN MUHARMAN,

Thank you for posting your question in the Microsoft Q&A forum.

In this case, I understand how urgent this situation must be, especially since all of admin accounts are similarly affected.

Please understand that as forum moderator, I don’t have access to the backend systems to troubleshoot this effectively due to privacy and security constraints. For that reason, the most efficient solution would be to contact Microsoft’s support team directly.

Therefore, please know you’re not alone in this, and I’ll guide you through every step to get you back in control as quickly as possible.

Option 1: Contact Microsoft Data Protection Support by Phone (Primary Method)  

Since you are the only administrator and are locked out, the most direct method is to call Microsoft's support line to raise a request for resetting your authentication method. For a full list of regional numbers, you can also visit this official page: Customer service phone numbers - Microsoft Support. The support team will assist you as soon as possible. For reference:  Get support | Microsoft Docs   

Here are some tips and an example of a prompt to help you navigate the IVR more effectively: 

In some countries, it is an automated conversation like: First, when you call the hotline, it will be asked as follows: 

IVR: What kind of problem are you concerned about? 

You: Authenticator. 

IVR: What kind of product do you use? 

You: Office 365 for business. 

IVR confirmation: education or company account? 

You: For companies 

IVR: Are you an administrator? 

You: Yes. 

IVR: Do you have the other administrator in your organization? 

You: No. 

IVR: Do you need a... Service request? 

You: Yes  

Note: This process should connect you with a live agent who will create a service request with the Data Protection team. They will then contact you to help you regain access. However, this team is always overwhelmed, so you might need to wait for them to call you, this should take 3-10 working days. I know that this is not a convenient solution to hear but it seems to be the only way.

Option 2: Create a Temporary Account (Trial Tenant) to Submit a Support Ticket (Alternative Method) 

If you have difficulty reaching an agent by phone, there is a reliable workaround. This involves creating a new, temporary Microsoft 365 account to contact the support team online. 

• Sign up for a new Microsoft 365 Business trial using this link: Compare All Microsoft 365 Plans. You will need to use a different, personal email address to register. 
• Once the trial account is created, log in to its Admin Center. 
• From the Admin Center, open a new Service Request. 
• In the ticket description, explain that you are locked out of your primary tenant (your.onmicrosoft.com) and that you need to speak with the Data Protection team to regain access. Provide your locked account's details and a good contact number for them to reach you. 
• For reference:  Get support | Microsoft Docs   

Important: Please remember to cancel the trial subscription after your original account issue is resolved to avoid any future charges. 

I am confident that the Data Protection team can resolve this for you. Please try the phone option first, as it is the most direct path.

I hope this information is helpful. Please follow these steps and let me know if it works for you. If not, we can work together to resolve this. If I misunderstood anything, please feel free to reach out.

Thank you for your patience and your understanding. If you have any questions, please feel free to reach out.

I'm looking forward for your reply.

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