Sign-in & Login Problems

How to Fix Microsoft Office 365 Sign-In Infinite Loop

WPS Editor Oct 9, 2026 869 views

Question details

Users are stuck in an endless sign-in loop when trying to access their Microsoft 365 accounts, preventing them from logging in.

How to Fix an Office 365 Sign-In Infinite Loop

Product: Microsoft 365
Device & OS: not provided
Scenario: Attempting to log into a Microsoft 365 account via a web browser for personal, business, or educational use.
Observed behavior: The authentication page repeatedly reloads or loops without granting access to the Microsoft 365 dashboard.

Before you start

Confirm whether you are using a personal, business, or education account, and have your mobile device ready in case two-factor authentication (2FA) is required.

Solution 1Recommended

Complete Two-Factor Authentication (2FA) Setup

Resolves sign-in loops caused by pending security requirements that interrupt the login sequence.

Microsoft 365 often requires two-factor authentication to be fully configured. Even if a grace period is displayed (e.g., 14 days to set up), the system might still trigger a loop if the setup is bypassed.

Initiate the sign-in process

Enter your email address and password on the Microsoft 365 login page.

Follow the security prompt

When prompted with 'More information required' or a similar security notice, click 'Next' instead of skipping.

Configure the authenticator

Follow the on-screen instructions to link the Microsoft Authenticator app or verify your phone number via SMS to complete the 2FA setup.

Complete Two-Factor Authentication (2FA) Setup

Authentication Restored: Once 2FA is fully configured, the system will break the loop and proceed directly to your account dashboard.

Solution 2

Clear Browser Cache and Disable Extensions

Removes corrupted session cookies and prevents browser add-ons from interfering with the Microsoft sign-in redirects.

Free Microsoft Office alternative

Switch to WPS Office for a Hassle-Free Offline and Online Experience

Tired of dealing with endless online sign-in loops and browser conflicts? WPS Office offers a powerful, lightweight, and free alternative to Microsoft Office that allows you to work offline without forcing complex authentication setups.

1. Download the installer: Visit the official WPS website and click the free download button for your operating system.
2. Install the software: Run the downloaded installer file and follow the quick on-screen instructions to complete the setup.
3. Open and edit files immediately: Launch WPS Office and directly open your existing Microsoft Office files (.docx, .xlsx, .pptx) to continue your work without interruptions.

No mandatory online sign-ins to start working on your local documents.Highly compatible with Microsoft Word, Excel, and PowerPoint file formats.Lightweight installation process that uses significantly fewer system resources.Familiar, intuitive user interface ensuring a seamless migration with zero learning curve.

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Frequently Asked Questions

Can I use an Incognito or Private browsing window to bypass the sign-in loop?

Yes. Opening an Incognito or InPrivate window temporarily ignores your existing browser cache and disables most extensions, which often allows you to sign into Microsoft 365 without triggering the loop.

Why does Microsoft 365 confuse my personal and business accounts?

If you use the same email address for both a personal Microsoft account and a business/education account, the system can get stuck trying to determine which profile to authenticate. Choosing the correct account type explicitly when prompted usually resolves this.

What should an administrator do if a user is stuck in a loop?

Microsoft 365 administrators should check the Microsoft Entra admin center to verify the user's sign-in logs. They may need to reset the user's password, clear active sessions, or adjust Conditional Access policies affecting the account.

Will updating my browser fix the Microsoft 365 login issues?

Sometimes. An outdated browser might fail to properly process Microsoft's modern authentication redirects. Updating your browser to the latest version ensures better compatibility and security.

Login & Account Issues