MFA & Verification Issues

How to Fix Outlook Sign-In Problems After Changing Phones

Maira Mehtab Sep 27, 2026 869 views

Question details

The user is stuck in a sign-in loop in Outlook and is not receiving verification codes after moving Microsoft Authenticator to a new mobile device.

Product: Microsoft Outlook / Microsoft Authenticator
Device & OS: not provided
Scenario: Attempting to sign in to an Outlook account after transferring the Microsoft Authenticator app to a new phone.
Observed behavior: Verification codes fail to arrive on the new device, resulting in Outlook remaining stuck in a continuous sign-in loop.

Before you start

If you still have access to your old phone and it has not been factory reset, connect it to Wi-Fi to see if you can still receive the approval prompt or temporary code to log in.

Solution 1Recommended

Reset MFA Registration for Work or School Accounts

If you use a Microsoft 365 business or education account, your organization's administrator must reset your Multi-Factor Authentication (MFA) methods.

Work and school accounts are managed by organizational policies. When you change phones, the security tokens do not automatically transfer, requiring administrative intervention to re-register the new device.

Contact your administrator

Reach out to your IT department or Microsoft 365 administrator and explain that you need to set up Authenticator on a new phone.

Request an MFA reset

Ask the administrator to log into the Microsoft Entra admin center and reset your MFA registration.

Set up a temporary method

Have the admin add a temporary authentication method (such as an SMS text or a phone call) so you can successfully sign in and register your new phone's Authenticator app.

Contact Microsoft Support (Admins Only)

If you are the sole administrator of the Microsoft 365 tenant and are locked out, you must contact Microsoft Data Protection or Microsoft 365 Support directly by phone for account recovery.

Administrative Action Required: Only an administrator with sufficient privileges in Microsoft Entra can perform the MFA reset for work or school domains.

Solution 2

Recover Personal Microsoft Accounts

For personal accounts (Outlook.com, Hotmail, Live), you will need to rely on alternative verification methods or contact Microsoft Account Support.

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Frequently Asked Questions

Why am I not getting Microsoft Authenticator codes on my new phone?

When you switch to a new phone, the Microsoft Authenticator app does not automatically transfer your secure account tokens. You must re-register the new device with your Microsoft account or have your IT admin reset your MFA settings to start receiving codes again.

Can I backup and restore Microsoft Authenticator to avoid sign-in loops?

Yes. Microsoft Authenticator has a Cloud Backup feature. If you enabled this feature on your old phone, you can choose 'Begin Recovery' when you open the app on your new phone to restore your accounts, provided you can pass the initial identity verification.

How do I bypass the Outlook sign-in loop once my MFA is reset?

To break the sign-in loop after an admin resets your MFA, clear your web browser's cache and cookies if you are using Outlook on the web. If you are using a desktop or mobile app, remove the account from your device settings entirely and re-add it.

Login & Account Issues