MFA & Verification Issues

Fix Microsoft Authenticator Loop: Cannot Sign Into Outlook

Huda Qurayshi Sep 27, 2026 869 views

Question details

The user is unable to sign in to Outlook due to a multifactor authentication loop, where Outlook requests a code from the Microsoft Authenticator app, but the app itself is signed out.

How to Fix the Microsoft Authenticator Loop When Signing Into Outlook

Product: Microsoft Outlook and Microsoft Authenticator
Device & OS: not provided
Scenario: Attempting to access a Microsoft 365 Outlook account while blocked by a multi-factor authentication (MFA) requirement.
Observed behavior: Outlook prompts for an authentication code from the Microsoft Authenticator app, but because the app is signed out, the user cannot generate the required code, resulting in an endless login loop.

Before you start

Check if you have an alternative authentication method previously set up, such as a backup phone number for SMS codes, before proceeding with administrator resets.

Solution 1Recommended

Contact Your Microsoft 365 Administrator for an MFA Reset

The most effective way to break an MFA loop for work or school accounts is to have your system administrator reset your authentication methods.

When you are caught in an authentication loop, the Microsoft system strictly expects a code from the Authenticator app. Only a system administrator has the necessary permissions to bypass this restriction by resetting your MFA status through Microsoft Entra ID or the Microsoft 365 admin center.

Identify your administrator

Reach out to your company's IT helpdesk, system administrator, or the person who originally assigned your Microsoft 365 work or school account.

Request an MFA reset

Ask the administrator to select 'Require re-register MFA' or temporarily disable multifactor authentication for your specific user account.

Set up Authenticator again

Once the admin has reset your MFA, attempt to sign into Outlook again. You will be prompted to set up Microsoft Authenticator from scratch using a new QR code.

Contact Your Microsoft 365 Administrator for an MFA Reset

Admin Access Required: If you are using a personal Microsoft account, you will need to use the Microsoft account recovery page instead of contacting an IT admin.

Solution 2

Sign In Using an Alternative Authentication Method

Use this solution to bypass the Authenticator app if you previously configured an SMS, phone call, or alternate email backup.

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Frequently Asked Questions

Why does Microsoft Authenticator keep asking for a code I cannot access?

This loop occurs when your app session expires or the app is signed out, but your Microsoft account still strictly requires multi-factor verification from that specific app instance. The app needs you to sign in, but signing in requires the app's code.

Can I fix the Microsoft Authenticator loop without contacting my IT administrator?

If it is a work or school account and you have not previously set up a secondary authentication method (like a backup phone number), you cannot fix it yourself. You must contact your IT administrator to reset your MFA status.

How do administrators reset my MFA settings?

Administrators can log into the Microsoft Entra ID (formerly Azure AD) or the Microsoft 365 admin center, locate your user profile under the 'Users' section, select 'Authentication methods', and click 'Require re-register MFA'.

Login & Account Issues