MFA & Verification Issues

How to Fix Repeated MFA Prompts in Outlook for iPhone

Emma Brown Sep 27, 2026 870 views

Question details

The user experiences continuous Multi-Factor Authentication (MFA) prompts when setting up or checking an Outlook.com or Microsoft 365 email account on an iPhone.

How to Fix Repeated MFA Prompts in Outlook for iPhone

Product: Outlook for iOS
Device & OS: iOS
Scenario: Adding a Microsoft 365 email to an iPhone or accessing the Outlook app for daily email management.
Observed behavior: The Outlook application repeatedly asks the user to authenticate via MFA, often caused by expired tokens, changed Conditional Access policies, or system glitches.

Before you start

Ensure you have your Microsoft 365 account credentials handy and are connected to a stable internet connection before modifying your iPhone's account settings.

Solution 1Recommended

Remove and Re-add the Outlook Account

Refreshing the account connection forces a new sign-in token, which usually resolves authentication loops and expired credentials.

When authentication tokens become corrupted or expire on your device, the app may fail to properly register your MFA confirmation. Removing the account completely and setting it up from scratch will clear the old tokens.

Open Outlook Settings

Launch the Outlook app on your iPhone, tap your profile icon in the top left corner, and then tap the Settings (gear) icon at the bottom left.

Delete the Account

Select the email account that is repeatedly prompting for MFA. Scroll to the bottom and tap 'Delete Account', then confirm your choice.

Re-add the Account

Return to the Outlook Settings menu, tap 'Add Mail Account', enter your email credentials, and complete the MFA verification process once more.

Tip: Restart your iPhone after removing the account and before re-adding it to ensure all cached data is completely cleared.

Solution 2

Update iOS and the Outlook Application

Keeping your device and apps updated ensures maximum compatibility with Microsoft's modern authentication standards.

Solution 3

Review Microsoft Entra Policies (For Administrators)

IT administrators should verify that recent changes to Conditional Access or MFA settings are not forcing a continuous re-authentication loop.

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Frequently Asked Questions

Why does Outlook keep asking for my password on my iPhone?

This typically happens when your sign-in token expires, your credentials become corrupted in the cache, or when IT administrators update security policies that require you to verify your identity again.

Does removing the Outlook app delete my emails?

No. Removing the app or deleting the account from the app will only remove the local data on your iPhone. Your emails are safely stored on the email server and will sync again once you log back in.

What is a Conditional Access policy in Microsoft 365?

It is a security feature managed by IT admins that evaluates user sign-ins and enforces rules, such as requiring MFA under certain conditions, like when accessing email from a new location or off the corporate network.

Login & Account Issues