Cannot log in to Admin Center due to missing MFA code

Hi @CK Cheung

Based on your description and the screenshot, I understand that you’re unable to access the Microsoft 365 Admin Center because the sign-in request is not appearing in the Microsoft Authenticator app, so you cannot complete the number-matching verification.

In this case, you can try the following steps:

-Open the Microsoft Authenticator app and pull down to refresh the app content, then check whether the sign-in request appears.

-Make sure notifications are enabled for Microsoft Authenticator on your mobile device.

-Make sure you’re using the latest version of Microsoft Authenticator.

-If you previously set up another authentication method for your account, such as SMS or email, select “Sign in another way” on the sign-in screen and try using that method instead.

If the issue still persists and there is another Global Administrator in your tenant, you can ask them to follow this article to reset your MFA methods so that you can register them again: Manage authentication methods for Microsoft Entra multifactor authentication - Microsoft Entra ID |…    

If you are the sole administrator and cannot sign in because you are unable to complete the MFA verification, you may need to contact Microsoft Support for further assistance.

1.Contact Microsoft Support by phone: Customer service phone numbers - Microsoft Support  

When a call is made to support, the first step is to provide an automated voice response from AI. You won't be able to speak to a support representative if you don't respond appropriately here.   

Here's an example of a response that actually led to a support representative. Please refer to it: 

Q. Can you tell me if you are calling as a home user who uses a product or service at home or a business user who uses it in your business to provide the best assistance? 
A.I am a business user. 
Q. Thank you. Can you give me the details of your inquiry? 
A. Login technical support. 
Q. First of all, can you tell me which products you are inquiring about today? 
A. Microsoft 365 business Standard。 
Q. Please wait a moment, I understand Microsoft 365. Are you calling about a new case or an existing one? 
A. New. 
Q. To receive phone support, your phone number must be associated with your Microsoft 365 admin profile. To do this, go to aka.ms/m365profile. Again, it aka.ms/m365profile . This can take 48 hours. In the meantime, you can go to aka.ms/m365profile and file a case online. If you prefer, you can also text the link to the phone number you are calling. What do you think? 
A. The phone number is already linked to the link. 
Q. Can you tell me about the products in your inquiry? 
A. Microsoft 365 Business Standard. 
Q. Are you a Global Administrator? 
A. That's right. 
Q. I'm sorry. I didn't understand. Are you a global administrator for your domain? 
A. Yes, I am a global administrator for the domain. 
Q. If you have any inquiries, you can contact a Microsoft representative. Are you sure? 
A. Yes. Please. 
Q. Yes, I understand. Please wait a moment.

Once connected, the agent will be able to create a ticket for you under the affected tenant and then transfer this ticket to Data Protection team who could help you to regain access.   

Please note that 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. To help prevent similar situations in the future, it's recommended that you have a secondary (backup) Global Administrator so you can resolve this type of issue on your own if it happens again.   

2.If you are unable to reach the appropriate support team by phone, you can consider directly submitting a support request as a helpful workaround:     

-Create a temporary Microsoft 365 tenant using a trial license: 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.     

-Use this new account to sign in to the Microsoft 365 Admin Center and submit a support request on behalf of your primary (locked) account.    

-Select the Help & support (headset) icon >If Support Assistant is enabled, turn it off >Type contact support in the search box >Select Contact support, then choose Phone or Email to submit your request. 

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, as your original global administrator account is locked out due to issues with multi-factor authentication. The trial account is free for one month. Be sure to delete it after submitting your support request to avoid any automatic renewals or charges from Microsoft.      

For further instructions, you can refer to the following Microsoft guides: 

Get support - Microsoft 365 admin | Microsoft Learn.    

Cancel your Microsoft business subscription in the Microsoft 365 admin center | Microsoft Learn 

I hope this information helps.