MFA & Verification Issues

Fix Microsoft Authenticator Sign-In Loop on a New iPhone

WPS Content Manager Sep 30, 2026 869 views

Question details

The user is stuck in a continuous sign-in loop while attempting to restore or set up Microsoft Authenticator on a replacement iPhone.

Fix Microsoft Authenticator Sign-In Loop on a New iPhone

Product: Microsoft Authenticator
Device & OS: iPhone / iOS
Scenario: Setting up the Microsoft Authenticator app on a new device after getting rid of the old phone.
Observed behavior: The Authenticator app prompts the user to approve the login request using the Authenticator app itself, making it impossible to complete the registration process.

Before you start

Before proceeding, check if you have an alternative authentication method set up (like a phone number or secondary email), or if you are still logged into your Microsoft 365 account on another device such as an iPad or laptop.

Solution 1Recommended

Contact Your Microsoft 365 Administrator (For Standard Users)

The most efficient way to break the sign-in loop for a work or school account is to have your organization's IT administrator reset your multi-factor authentication (MFA) settings.

Because work and school accounts are managed by your organization, you do not have the administrative rights to bypass the MFA loop yourself once your old device is disconnected.

Your administrator has access to the Azure Active Directory (Microsoft Entra ID) and can force a re-registration of your authentication methods.

Identify your IT support contact

Reach out to your company's IT helpdesk, system administrator, or your school's technical support department.

Request an MFA reset

Explain that you replaced your iPhone and are stuck in a Microsoft Authenticator sign-in loop. Ask them to select your user profile in their admin center and click 'Require re-register MFA'.

Set up the app again

Once the administrator confirms the reset, open the Microsoft Authenticator app on your new iPhone and add your work or school account from scratch.

Contact Your Microsoft 365 Administrator (For Standard Users)

Alternative Method Prompt: After the reset, you will be guided through the standard setup process on your new iPhone, generating a new QR code or sign-in link without asking for approval from the old device.

Solution 2

Contact Microsoft Data Protection Team (For Sole Administrators)

If you are the only global administrator for your organization and are locked out by this loop, you must verify your identity with Microsoft Business Support to regain access.

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Frequently Asked Questions

Why does Microsoft Authenticator ask me to approve the sign-in on the app itself?

This loop happens because Microsoft's security system still recognizes your old device as your primary authentication method. Because your new iPhone is not fully registered yet, the system sends the approval prompt to the old device, or falls into a loop asking the current device to verify itself.

Can I bypass the Authenticator app using SMS or a phone call?

You can only use SMS or a phone call if you previously configured them as alternative authentication methods in your Microsoft 365 security settings. If you did, click 'I can't use my Microsoft Authenticator app right now' on the login screen to choose a different verification method.

Should I delete the Authenticator app from my old iPhone before setting up the new one?

No. It is highly recommended to keep the Authenticator app active on your old iPhone until you have completely set up and verified the app on your new device. Deleting it prematurely is the primary cause of sign-in loops.

Login & Account Issues