MFA & Verification Issues

How to Sign In to Microsoft 365 Without Authenticator App Codes

Chanuka Geekiyanage Sep 29, 2026 868 views

Question details

The user is unable to sign in to Microsoft 365 because they cannot access their Microsoft Authenticator codes after switching to a new device or losing their previous registration.

How to Sign In to Microsoft 365 When Authenticator Codes Are Unavailable

Product: Microsoft 365
Device & OS: iPhone (iOS)
Scenario: Attempting to log into a Microsoft 365 account without access to the mobile device hosting the configured Authenticator app.
Observed behavior: The sign-in process is blocked at the multi-factor authentication (MFA) step because the required verification code cannot be generated or received.

Before you start

Determine whether you are trying to access a personal Microsoft account or a work/school account, as the recovery steps and administrative controls differ significantly.

Solution 1Recommended

Use an Alternative Verification Method

Bypass the Authenticator app by using a backup verification method previously registered to your account, such as an SMS or phone call.

This solution works if you have previously set up secondary verification methods in your Microsoft account security settings.

Enter your login credentials

On the Microsoft 365 sign-in screen, enter your email address and password as you normally would.

Select an alternate login option

When prompted to enter the Authenticator code, click on the 'Sign in another way' or 'I can't use my Microsoft Authenticator app right now' link.

Choose your backup method

Select an alternative method from the provided list, such as receiving a text message (SMS) or a phone call to your registered backup number.

Verify and sign in

Enter the verification code you receive via text, or follow the prompts on the automated phone call to complete the sign-in process.

Set up the new device

Once successfully logged in, navigate to your account security settings to set up the Microsoft Authenticator on your new iPhone and remove the old device.

Account Access Secured: Registering your new device immediately after gaining access ensures you will not get locked out during your next session.

Solution 2

Request an MFA Reset from Your IT Administrator

If you are using a work or school account and have no alternate verification methods, your administrator must reset your multi-factor authentication settings.

Free Microsoft Office alternative

Experience Hassle-Free Productivity with WPS Office

If you're tired of complex account lockouts and expensive subscriptions, WPS Office is a lightweight, completely free alternative to Microsoft Office. It doesn't force complex cloud authentication for offline work, allowing you to access your files effortlessly while maintaining seamless compatibility with Word, Excel, and PowerPoint.

1. Download the Installer: Visit the official WPS Office website and click the free download button for your operating system.
2. Install WPS Office: Run the downloaded installer and follow the simple on-screen instructions to complete the setup.
3. Open Your Office Files: Launch WPS Office and open your existing Microsoft files to start editing immediately without any formatting loss.

Fully compatible with Microsoft Office formats like .docx, .xlsx, and .pptx.Work offline securely without requiring constant multi-factor authentication.Lightweight installation that runs smoothly on Windows, Mac, and Linux.All-in-one suite combining document, spreadsheet, presentation, and PDF tools in one window.

microsoft office alternative - wps office

Frequently Asked Questions

How do I set up Microsoft Authenticator on a new phone?

Once you successfully sign in to your Microsoft account using an alternative method, go to the Security dashboard, navigate to Advanced security options, and select 'Add a new way to sign in or verify'. Choose 'An app' and follow the QR code instructions to link your new phone.

What if I don't have an alternate verification method set up?

For personal accounts, you may need to fill out the Microsoft account recovery form. For work or school accounts, you must contact your organization's IT administrator to revoke your old MFA sessions and require a re-registration on your next login.

Can I disable Microsoft Authenticator entirely?

For personal accounts, you can disable two-step verification in your account's Security settings. However, for work or school accounts, multi-factor authentication is usually mandated by organizational security policies and cannot be disabled by the end user.

Why isn't 'Sign in another way' appearing on my login screen?

This option only appears if you have previously added and verified secondary authentication methods (like a backup phone number or alternate email address) in your Microsoft account security settings prior to losing access to your authenticator app.

Login & Account Issues