MFA Security Issues

Fix "Additional Authentication Is Required" in Microsoft Teams on iOS

Guest Writer Oct 9, 2026 869 views

Question details

Users are unable to log into Microsoft Teams on iOS because the app demands additional authentication.

How to Fix "Additional Authentication Is Required" in Microsoft Teams

Product: Microsoft Teams
Device & OS: iOS
Scenario: Attempting to sign in to a Microsoft 365 business account using the Microsoft Teams mobile application.
Observed behavior: The application halts the login process and displays an "Additional Authentication Is Required" error message.

Before you start

Ensure you have the Microsoft Authenticator app downloaded from the Apple App Store, as it is typically required to complete the setup process for business accounts.

Solution 1Recommended

Configure Multifactor Authentication (MFA) via Prompts

Follow the on-screen instructions to register your iOS device for MFA, fulfilling your organization's security requirements.

When security defaults or multifactor authentication (MFA) policies are enabled for a Microsoft 365 business account, users must register their devices. Completing this setup will grant you access to Microsoft Teams and other Microsoft 365 apps.

Follow the Authentication Prompts

Tap on the 'Next' or 'Set up now' button when the 'Additional Authentication Is Required' message appears on your iOS device screen.

Link the Authenticator App

Open the Microsoft Authenticator app and choose the option to add a new Work or School account.

Verify Your Identity

Approve the sign-in request sent to your Authenticator app or enter the provided verification code to complete the login process for Microsoft Teams.

Configure Multifactor Authentication (MFA) via Prompts

Missing Setup Option: If you do not see a prompt to set up authentication or if you are stuck in a continuous login loop, your account may need to be reset.

Solution 2

Contact Your Microsoft 365 Administrator

If end-user setup fails, your organization's IT administrator must review your account's conditional access or security default settings.

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Frequently Asked Questions

Why is Microsoft Teams suddenly asking for additional authentication on my iPhone?

This occurs when your organization enables Microsoft 365 security defaults or specific Multifactor Authentication (MFA) policies to protect business data from unauthorized access.

Can I disable the "Additional Authentication Is Required" prompt?

As an end user, you cannot bypass or disable this prompt. Only your organization's Microsoft 365 administrator can modify security defaults, though disabling it is generally not recommended for security reasons.

What should I do if I cannot find a setup option on the authentication screen?

If the screen offers no way to proceed, your account may be out of sync. You need to contact your IT administrator so they can reset your MFA sessions in the Microsoft 365 Admin Center.

Microsoft Office Security Issues