MFA & Verification Issues

How to Recover Microsoft 365 Sign-In After Losing Authenticator App

Elise Williams Sep 25, 2026 869 views

Question details

The user needs to access their Microsoft 365 account after losing the device that hosted their Microsoft Authenticator app.

How to Recover Microsoft 365 Sign-In After Losing the Authenticator App

Product: Microsoft 365
Device & OS: not provided
Scenario: Replacing a mobile phone without transferring the Microsoft Authenticator app, leading to an account lockout.
Observed behavior: The Microsoft 365 account prompts for multifactor authentication approval from the lost device, completely preventing the user from signing in.

Before you start

Before proceeding, check if you previously set up an alternative authentication method (like SMS or a secondary email) and locate your organization's IT help desk contact information.

Solution 1Recommended

Contact Your IT Administrator for an MFA Reset

The most secure and direct way to regain access to an enterprise Microsoft 365 account is by having your IT administrator reset your multifactor authentication settings.

If you are using a corporate or school Microsoft 365 account (such as E3), your organization's IT administrators control your security settings. They have the ability to revoke your old device's access and require a new MFA setup upon your next login.

Contact IT Support

Reach out to your company's IT help desk, system administrator, or the person who provided your Microsoft 365 credentials.

Request an MFA Reset

Explain that you lost your phone and ask them to 'Require re-register MFA' for your account in the Microsoft Entra ID (formerly Azure AD) admin center.

Set Up Your New Device

Once the administrator confirms the reset, go to the Microsoft 365 login page on your computer. After entering your password, you will be prompted to set up the Microsoft Authenticator app on your new phone.

Contact Your IT Administrator for an MFA Reset

Wait before creating a new entry: Do not attempt to create a new Authenticator entry for this account on your new phone until the administrator has cleared the old settings, as it will not sync properly.

Solution 2

Sign In Using an Alternative Verification Method

Use a backup authentication method, such as a text message or phone call, to bypass the Authenticator app if you previously configured one.

Free Microsoft Office alternative

Use WPS Office to Stay Productive Offline

While you wait for your IT department to resolve your Microsoft 365 login issues, you can continue working on your documents using WPS Office. It is a free, lightweight suite that does not require complicated cloud authentication to edit your local files.

1. Download and Install: Visit the official WPS Office website to download and install the free software on your computer.
2. Open Your Documents: Right-click your existing Word, Excel, or PowerPoint files and select 'Open with WPS Office' to continue editing.
3. Save in Microsoft Formats: Work as usual and save your files in standard Microsoft formats so they are ready to upload once your Microsoft 365 access is restored.

No complex MFA or cloud authentication required to edit local filesSeamless compatibility with Microsoft Office formats (.docx, .xlsx, .pptx)Free, lightweight, and fast installationFamiliar user interface ensures a zero-learning-curve migration

Frequently Asked Questions

Can I recover my Microsoft Authenticator accounts on a new phone without the old one?

Yes, but only if you had 'Cloud Backup' enabled on your old phone before you lost it. You can recover your credentials by opening the new Authenticator app, tapping 'Begin recovery', and signing in with your personal Microsoft account. If it is an organizational account without backup, you must contact your IT admin.

How do I turn off MFA for my Microsoft 365 account?

If you are using an enterprise or school account, you cannot turn off multifactor authentication yourself. Only your organization's IT administrator has the administrative privileges to disable or reset MFA requirements in the security portal.

What happens to my data if I cannot access my Microsoft 365 account?

Your cloud documents, emails, and settings remain safely stored on Microsoft's servers. You will not lose any data. Once your administrator resets your MFA and you log back in, all your files will be exactly as you left them.

Login & Account Issues