How can I re-sync my authenticator with my admin account for 365 business

Question

I recently created my business account, and set up my admin with one of the business email users. I have since somehow un-synced my authenticator application with the admin account. I am receiving the code still however I am not able to sign back into the account on the authenticator application to be able to approve it.

Each time I try to sign in, it throws a new code to authenticate. I am unable to find any information on how to reset my MFA for the only admin account on my org.

Pleaase HELP!!

Answer 1

Hi Shylo Clermont

Thank you for reaching out to Microsoft Q&A Forum and sharing your experience.

When the only Global Administrator is locked out because Microsoft Authenticator is no longer usable, MFA cannot be reset from within the tenant, and re‑adding the account in the Authenticator app alone will not resolve the issue.

Before escalation, please double‑check the sign‑in screen to see if there is any option such as “Sign in another way” or another registered method (SMS, phone call, security key). If no alternative method is available and the sign‑in keeps looping, you will need to follow either of these steps:

• Contact Microsoft 365 Business Support using the phone numbers listed here: Customer service phone numbers - Microsoft Support.
• If the phone line is not helpful, you can create a trial tenant to submit a support request as an alternative workaround: Go to Microsoft 365 Business Plans and Pricing and click Try for free to set up a temporary tenant. After that you will be able to access to Microsoft 365 Admin Center and click the "Help & support" icon to submit a support request. Please mention that you are raising the ticket on behalf of the affected tenant that you cannot access. The support team will help create a ticket for the affected tenant, and later the Microsoft Data Protection team will assist you. For further instructions, please follow this guide: Get support - Microsoft 365 admin | Microsoft Learn.

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 delete it after submitting your support request to avoid any automatic renewals or charges from Microsoft.

Please note that this process will take more time than usual (7-14 working days) for your account to get access again as Microsoft's Data Protection team is always overwhelmed with the number of tickets. As a forum moderator, I do not have access to Microsoft internal system to assist or push this process to be quicker.

I hope my information is helpful. Please give me any updates once you get this resolved.

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Answer 2

To re-sync your Microsoft Authenticator with your admin account for Microsoft 365 Business, you will need to reset your Multi-Factor Authentication (MFA) settings. Since you mentioned that you are the only admin in your organization, here are the steps you can follow:

1. Contact Microsoft Data Protection Support by Phone: Since you can't access the Admin Portal, you should reach out to Microsoft’s Global Customer Service to request a reset of your authentication method. You can find the customer service phone numbers for your region on the Microsoft Support website. When you call, explain that you are the only admin and need assistance with MFA.
2. Prepare for the Call: When you call, you may encounter an automated system. Here’s a suggested prompt to navigate through it:
   • When asked about the problem, say "Authenticator."
   • Specify that you are using "Office 365 for business."
   • Confirm that it is a company account and that you are the administrator.
   • Mention that you do not have another administrator in your organization and that you need to create a service request.
3. Alternative Method - Create a Temporary Account: If you cannot reach a live agent, consider creating a new trial tenant. Sign up for a trial subscription, which will allow you to access the admin console of the new tenant. From there, you can submit a support ticket to the Data Protection team, explaining your situation and requesting a reset of your MFA settings for your original account.
4. Provide Necessary Information: When contacting support, be ready to provide your admin account email, the domain name of your locked tenant, and any error messages you are receiving.

These steps should help you regain access to your account and re-sync your authenticator app.

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References:

• Global Admin Locked out - Microsoft Q&A
• Requesting a Tenant Admin MFA Reset - Microsoft Q&A