MFA Security Issues

How to Recover Microsoft 365 Admin Account After Lost FIDO Security Keys

Maira Mehtab Sep 28, 2026 870 views

Question details

A Microsoft 365 tenant administrator is locked out of their account due to stolen or lost FIDO security keys, which were the only configured authentication method.

Product: Microsoft 365
Device & OS: not provided
Scenario: Attempting to sign in to the Microsoft 365 administrator console without the primary MFA FIDO key.
Observed behavior: The administrator cannot sign in or bypass the MFA prompt because the required FIDO security keys are missing or stolen, and no alternative authentication methods are available.

Before you start

Gather proof of tenant ownership such as billing invoices, domain registration records, and official Microsoft correspondence, as support will strictly require these for verification.

Solution 1Recommended

Ask Another Administrator to Revoke the Stolen Keys

If your Microsoft 365 tenant has another user with global administrator privileges, they can quickly restore your access without contacting Microsoft.

Contact the alternative admin

Reach out to the other global administrator for your Microsoft 365 tenant and explain the lockout situation.

Navigate to user management

Have the alternative administrator log in to the Microsoft Entra admin center and go to Users > All users, then select your locked account.

Revoke FIDO keys and reset MFA

Under Authentication methods, the admin must revoke the stolen FIDO security keys and select the option to require re-registration of MFA upon your next login.

Solution 2

Escalate to the Microsoft 365 Data Protection Team

If you are the sole administrator for the tenant, you must contact Microsoft Support directly and undergo a strict verification process to regain access.

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1. Download the software: Visit the official WPS Office website and download the free installation package for your operating system.
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3. Start editing locally: Open WPS Writer, Spreadsheet, or Presentation to immediately open and edit your existing Microsoft Office files.

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Frequently Asked Questions

Can I bypass the FIDO security key requirement if I know my password?

No, if FIDO security keys are enforced as your only authentication method, knowing your correct password is not enough to bypass the mandatory Multi-Factor Authentication (MFA) prompt.

What kind of proof do I need to verify Microsoft 365 tenant ownership?

You should prepare your billing invoices, the credit card information used for the subscription, DNS/domain registration records, and any official correspondence with Microsoft regarding the account.

How long does it take the Data Protection team to restore access?

Because it involves overriding strict administrator security settings, the verification process can take several days or even weeks, depending on how quickly you can provide the requested evidence.

Should I have multiple global administrators configured?

Yes, Microsoft highly recommends having at least two 'break-glass' or emergency access global administrator accounts configured with alternative MFA methods to prevent total tenant lockouts in emergencies.

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