How do I access my account when Microsoft Authenticator is not setup?

Hi @Madie VB,

Thank you for posting on Microsoft Q&A forum and I'm sorry to hear you're having trouble logging into your Microsoft account.   

Changing to a new phone often triggers this issue because your Multi-Factor Authentication (MFA) settings usually need to be reset. When you switch devices or reinstall the Microsoft Authenticator app, your new phone isn’t automatically configured for authentication. Since the app is still tied to your previous device, you’re unable to receive authentication codes on the new one, which is why you can’t access your account right now. 

Since you are using a work or school email address, the MFA settings are managed by your organization's IT department. For assistance with resetting or updating your MFA, you will need to contact them directly to resolve this.   

Please contact your company's IT Help Desk or support team and explain the situation. You can say: "I am stuck in a login loop between Microsoft Teams and the Microsoft Authenticator app. I cannot get the code to sign in."   

Specifically ask them to “Reset my MFA settings or allow me to re-register for MFA". This is a standard request, and your organization's IT team should be able to assist you with it.  

You can also share the steps in this Microsoft article for them so they can help reset your MFA settings for you Manage user authentication methods for Microsoft Entra multifactor authentication.  

Once your organization's in has reset your MFA, the next time you log in to your account, you will be guided through the process of setting up the Microsoft Authenticator app again from the beginning by scanning a QR code. This will break the loop and allow you to access your account normally.   

Please note that forum moderators or advisor do not have access to user account settings and cannot assist with logging in, resetting passwords, or changing access rights. While we do not have access to internal systems or administrative tools required to resolve account-specific or backend-related issues, but we’ll continue doing our best to support you within the scope of our responsibilities.       

I hope this helps you regain access to your account quickly. I'm glad to assist and truly hope the information provided has been useful. Please feel free to reach out anytime if you need further assistance. 

If you find my post helpful, kindly consider marking it as the accepted answer. Doing so can assist others in the community who may have similar questions in finding solutions more quickly. Thank you for your kindness and contributions to the forum. 

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To break out of the loop and access the account, use an alternative verification method or have MFA reset by an admin or Microsoft support, depending on the account type and role.

1. Try another MFA method (if configured)

• On the sign-in screen where the Authenticator code is requested, choose “Sign in another way” (or similar link).
• Select another method such as SMS, phone call, or email if they were previously added.
• Complete sign-in and then update or re-register the Authenticator method from the security/MFA settings.

If no other method is available, the path depends on whether this is a work/school (Microsoft 365 business) account and whether there are other admins.

2. If this is a work or school (business) account and there is another admin

• Contact the organization’s Microsoft 365/Microsoft Entra administrator.
• The admin should:
  1. Go to the Microsoft Entra admin center (https://entra.microsoft.com).
  2. Navigate to Users → All users and select the affected user.
  3. Open Authentication methods.
  4. Use Require re-register multifactor authentication to reset MFA.
• After the reset, sign in again; the account will be prompted to set up Authenticator from scratch (scan QR code in the app).

3. If this is a work or school account and there is no other admin (sole admin scenario)

• Microsoft’s Data Protection team must reset the admin’s MFA.
• Call the regional Customer service phone numbers listed in Microsoft Support.
• When the IVR (automated system) asks questions, respond along these lines:
  • Problem: “Authenticator” or “lost access to Authenticator.”
  • Product: “Office 365 for business.”
  • Education or company account: “For companies.”
  • Are you an administrator?: “Yes.”
  • Any other admins?: “No.”
  • Need a service request?: “Yes.”
• Ask the agent to open a ticket with the Data Protection team to reset the admin’s MFA for the tenant.

4. If support is hard to reach: create a trial tenant to open a ticket If it is impossible to get to a live agent via phone:

• Sign up for a trial Microsoft 365 tenant (e.g., from the Microsoft 365 plans trial page).
• After creating the trial tenant, go to the Microsoft 365 Admin Center for that new tenant.
• Use Help & support to open a support ticket.
• In the ticket, clearly state:
  • This trial tenant is only for contacting support.
  • The email and domain of the original (locked) tenant.
  • That this is the only global admin and MFA is blocking access.
  • The exact error/loop with Microsoft Authenticator.
• Ask to be connected to the Data Protection team to reset MFA on the original tenant.
• After resolution, cancel the trial subscription to avoid charges.

5. If the device with Authenticator is lost or replaced

• If another sign-in method exists, use Sign in another way and then:
  • Remove the old Authenticator registration.
  • Add the new phone by setting up Microsoft Authenticator again.
• If no other method exists, follow the admin/Data Protection steps above.

6. If verification codes (SMS/email) are not arriving If switching to SMS/email is attempted but codes do not arrive:

• Avoid repeated code requests; excessive attempts can cause temporary blocking.
• Check:
  • Whether the phone blocks texts from unknown numbers.
  • That the inbox is not full and the messaging app is working.
  • That the phone number or email is correct in Security info.
• If codes still do not arrive, choose another method or wait until access to the registered phone/email is possible.

Once access is restored, it is recommended to:

• Configure at least two MFA methods (e.g., Authenticator + SMS or email).
• Consider using passwordless options such as Microsoft Authenticator or Windows Hello for more reliable sign-in.

References:

• Common problems with two-step verification for a work or school account
• Use a screen reader to set up and troubleshoot multifactor authentication
• I cant log in to my business account because it is requiring Authenticator app which I do not have - Microsoft Q&A
• I have a Micrsoft business account and I am the admin and the only user registered under this account. I can't log in because i have replaced my phone and the authenticator doesn't work. - Microsoft Q&A
• Microsoft authenticator sending me into a spiral - Microsoft Q&A
• Requesting a Tenant Admin MFA Reset - Microsoft Q&A
• Having problems getting text codes to confirm my account - Microsoft Q&A