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Fix Microsoft 365 Admin Center Account Cannot Be Verified Error
Question details
The user is unable to access the Microsoft 365 Admin Center due to MFA verification failures, displaying messages like Account cannot be verified or error code 399287.
- Product
- Microsoft 365 Admin Center
- Device & OS
- not provided
- Scenario
- Attempting to sign in to the Microsoft 365 Admin Center as an administrator.
- Observed behavior
- Authenticator registration and SMS verification fail with errors indicating the account does not exist or cannot be verified, blocking admin access.
Before proceeding, check if there are other Global Administrators in your Microsoft 365 tenant who currently have access. Also, have your tenant domain, account address, and proof of identity ready.
Request MFA Reset from Another Global Administrator
If your organization has multiple global admins, another admin can reset your multi-factor authentication methods quickly.
This is the fastest method to regain access. Any active Global Administrator can manage authentication settings for other users, including other admins.
Reach out to another Global Administrator in your Microsoft 365 tenant.
Ask them to log into the Microsoft 365 Admin Center, go to Users, and select Active users.
Have them select your account, click on 'Manage multifactor authentication', and choose to require you to provide contact methods again.
Contact Microsoft Data Protection Support
Use this method if you are the only global administrator and are completely locked out of your tenant.
Submit Support Ticket Using a Temporary Trial Tenant
If phone support is unreachable, create a temporary tenant to submit an official support ticket.
Try WPS Office as a Lightweight Alternative
While administrative account lockouts in Microsoft 365 can halt your productivity, WPS Office provides a robust, free, and lightweight alternative for your daily document, spreadsheet, and presentation needs. Experience seamless compatibility without the complex administrative overhead.
- 1. Download the installer: Visit the official WPS Office website and click the free download button.
- 2. Install the software: Run the installer and follow the on-screen instructions to complete the setup.
- 3. Open your files: Launch WPS Office and directly open any of your existing Microsoft Office documents.
Frequently Asked Questions
What does error code 399287 mean in Microsoft 365?
Error code 399287 typically indicates a failure in the authentication process, often related to Multi-Factor Authentication (MFA) registration or SMS verification issues where the system cannot verify the account's existence or identity.
Can I bypass Microsoft 365 Authenticator if I lose my phone?
If you lose your phone, you cannot bypass the Authenticator yourself if it is the only method set up. You must contact another Global Administrator to reset your MFA methods or contact Microsoft Support if you are the sole admin.
How long does it take for Microsoft Data Protection to recover an admin account?
Account recovery by the Microsoft Data Protection team can take anywhere from a few days to a couple of weeks, as they require strict identity verification and proof of administrative authority for security reasons.
Will I be charged for the temporary Microsoft 365 trial tenant?
No, as long as you cancel the trial subscription before the billing period begins (usually 30 days). Always remember to cancel it once your original tenant access is restored.
