Sign-in & Login Problems

How to Fix Microsoft 365 Repeated Sign-in and Login Loop Issues

Tauseeq Magsi Sep 25, 2026 872 views

Question details

The user is stuck in a repeated sign-in loop on Microsoft 365, unable to authenticate the account or access files even after attempting to reinstall the software.

How to Fix Microsoft 365 Repeated Sign-in and Login Loop Issues

Product: Microsoft 365
Device & OS: not provided
Scenario: Attempting to launch and authenticate Microsoft 365 applications to access the user account and associated documents.
Observed behavior: Microsoft 365 continuously prompts for sign-in, but providing the correct credentials does not restore access, trapping the user in an authentication loop.

Before you start

Verify that your Microsoft 365 subscription is active via the online web portal, and ensure you have your correct account credentials ready before making system-level changes.

Solution 1Recommended

Clear Saved Microsoft and Office Credentials

Removing outdated or corrupted credential caches is the most effective way to resolve persistent authentication loops in Microsoft 365.

Often, your operating system caches older login tokens that conflict with your current Microsoft 365 session. Deleting these cached credentials forces Office to establish a fresh connection to the authentication servers.

Open Credential Manager

Use your computer's system search bar to type 'Credential Manager' and open the utility.

Locate Windows Credentials

Click on the 'Windows Credentials' tab to view all saved system and application passwords.

Remove Office Credentials

Scroll through the list to find any entries starting with 'MicrosoftAccount' or 'MicrosoftOffice'. Click the drop-down arrow next to each and select 'Remove'.

Restart and Sign In

Restart your computer, open a Microsoft 365 application like Word or Excel, and sign in again when prompted.

Clear Saved Microsoft and Office Credentials

Clear All Related Entries: Be sure to remove all credentials related to Microsoft Office to ensure a completely clean authentication slate.

Solution 2

Perform a Clean Uninstall and Reinstall of Office

If a standard reinstallation did not work, use Microsoft's official removal tool to clear hidden configurations and account-detection files.

Free Microsoft Office alternative

Switch to WPS Office: A Hassle-Free Alternative

Tired of dealing with frustrating Microsoft 365 login loops and authentication errors? WPS Office is a free, lightweight, and user-friendly alternative that does not rely on strict cloud verifications to let you work. Enjoy full format compatibility and a familiar UI without the sign-in headaches.

1. Download WPS Office: Visit the official WPS Office website and download the free installer for your operating system.
2. Install the Software: Run the downloaded setup file and follow the quick installation prompts.
3. Open Your Files: Double-click your existing Microsoft Office documents to open them directly in WPS Office without needing to log into a cloud service.

Free and lightweight Office suite with low system requirementsSeamlessly compatible with Microsoft Word, Excel, and PowerPoint formatsEdit local files instantly without mandatory cloud sign-insFamiliar user interface makes transitioning effortless

microsoft office alternative - wps office

Frequently Asked Questions

Why does Microsoft 365 keep asking me to sign in repeatedly?

This sign-in loop typically occurs due to corrupted cached credentials stored on your device, conflicting Microsoft accounts logged in simultaneously, or authentication bugs introduced by a recent Office update.

Will uninstalling Microsoft 365 delete my personal documents?

No. Uninstalling Microsoft 365 only removes the application files. Your locally saved documents and any files saved securely to your OneDrive will remain intact and unaffected.

What should I do if clearing credentials and reinstalling doesn't work?

If the issue persists after a clean reinstall and credential wipe, the problem may be account-related. Log into the Microsoft account web portal to verify your subscription status, or contact Microsoft Support directly for account and subscription verification.

Login & Account Issues