How to Fix Microsoft Teams Login Loop on iPhone and Surface Pro
Question details
The user is trapped in a continuous sign-in loop where Microsoft Teams repeatedly returns to the login screen, and Microsoft Authenticator fails to display the required number-selection prompt.
- Product
- Microsoft Teams, Microsoft Authenticator
- Device & OS
- iPhone, Surface Pro 7
- Scenario
- Attempting to sign in to the Microsoft Teams application using Microsoft Authenticator for verification.
- Observed behavior
- Teams loops back to the login screen without signing in. The Authenticator app does not trigger the number-selection prompt, leaving SMS text-message authentication as the only functional method.
Before beginning, temporarily rely on SMS text-message authentication to access your account, and ensure you have your Microsoft account credentials ready for reconfiguration.
Reinstall Teams and Reconfigure Authenticator
Completely reinstalling the Microsoft Teams app and verifying Microsoft Authenticator settings resolves underlying cache corruption and sync issues causing the loop.
Login loops frequently occur when application cache data becomes corrupted or when the Authenticator app loses its seamless connection with device notifications.
Confirm whether you are using a school or business account, as institutional policies may affect logins. Note any specific error codes displayed before the screen loops back.
On your iPhone, long-press the Teams app icon and select 'Remove App'. On your Surface Pro 7, navigate to Settings > Apps > Installed apps, locate Microsoft Teams, and click 'Uninstall'.
Perform a complete restart on both your iPhone and your Surface Pro 7 to ensure all temporary session data and cache files are cleared from system memory.
Download and install the latest version of Microsoft Teams from the Apple App Store on your iPhone, and from the Microsoft Store or official website on your Surface Pro.
Open the Microsoft Authenticator app. Ensure it is updated to the latest version, your account is properly registered, and system notification permissions are fully allowed so the number-selection prompt can appear.
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Frequently Asked Questions
Why does Microsoft Teams keep looping back to the login screen?
This is typically caused by corrupted local cache data, outdated app versions, or a breakdown in communication between the Teams app and the Microsoft Authenticator service on your device.
How do I fix Microsoft Authenticator not showing the number prompt?
Ensure your device's operating system allows push notifications for the Authenticator app. You can also open the Authenticator app manually when signing in and pull down on the screen to force a sync.
Can I permanently switch to text-message authentication for Teams?
Yes, you can configure your primary authentication method in your Microsoft Account Security settings online. However, many business or school IT administrators enforce the use of the Authenticator app for enhanced security.
