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How to Sign In to Microsoft 365 After Losing Your Authentication Phone
Question details
The user is unable to sign in to the Microsoft 365 admin center because they have lost the phone used for multi-factor authentication (MFA) and lack alternative verification methods.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Attempting to sign in to a Microsoft 365 work, school, or admin account without access to the designated authentication device.
- Observed behavior
- Access is blocked at the MFA verification step, preventing the user from entering the Microsoft 365 admin center or their account dashboard.
Before proceeding, check if you have an alternative authentication method set up on the sign-in screen (such as an alternate email or phone number) and have your tenant domain details ready.
Ask Another Administrator to Reset Your Authentication Method
If your organization has multiple administrators, another admin can easily reset your MFA settings in Microsoft Entra ID.
This is the fastest method for regaining access to a work or school account when an authentication device is lost.
Reach out to another IT administrator or your organization's help desk.
Request the administrator to sign in to the Microsoft Entra admin center using their credentials.
Have them navigate to the 'Users' section, search for your account, and select it.
Ask them to go to 'Authentication methods' and select 'Require re-register MFA'. On your next sign-in, you will be prompted to set up a new authentication phone.
Contact Microsoft Data Protection Support
If you are the only administrator for your Microsoft 365 tenant, you must contact Microsoft directly to verify your identity and regain access.
Recover a Personal Microsoft Account
If the locked account is a personal Microsoft account rather than a work or school account, use the standard account recovery form.
Experience a Hassle-Free Office Suite with WPS Office
Locked out of Microsoft 365 due to authentication issues? WPS Office offers a free, lightweight, and user-friendly alternative that does not require complex admin center configurations just to edit your local documents. Enjoy seamless compatibility with all your existing files.
- 1. Download the installer: Visit the official WPS Office website and download the free installation package.
- 2. Install the software: Run the installer and follow the on-screen instructions to set up WPS Office on your device.
- 3. Start editing: Open WPS Office and start editing your documents immediately, without complex cloud sign-ins.
Frequently Asked Questions
How long does it take for Microsoft Data Protection to recover a sole admin account?
The recovery process for a sole administrator can take anywhere from a few days to a couple of weeks, as the Data Protection team must thoroughly verify your identity and business ownership to prevent unauthorized access.
Can I bypass the Microsoft Authenticator app if I lost my phone?
You can only bypass it if you previously set up alternative verification methods, such as receiving a text message to a backup phone number or using a secondary email address. Otherwise, an IT admin or Microsoft Support must reset your settings.
What should I do if I find my lost authentication phone later?
If your administrator has already reset your MFA settings, the old phone's authenticator app will no longer generate valid codes for that account. You will need to re-register the device through your Microsoft account security settings.
Can a regular user contact Microsoft Support to reset their MFA?
No, Microsoft Support cannot reset passwords or MFA settings for regular users in a work or school organization. You must contact your own organization's IT help desk or administrator for assistance.
