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Fix Microsoft 365 Repeated Authentication Prompts
Question details
The user is experiencing a continuous loop of sign-in prompts for Microsoft 365 services, even when applications like Office and OneDrive are not actively in use.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Trying to maintain a stable connection to Microsoft 365 services without being interrupted by persistent, unprompted sign-in requests.
- Observed behavior
- Microsoft Entra sign-in logs display multiple authentication failures from Office, OneDrive Sync Engine, and Bing Search, causing constant login pop-ups despite the user account not being locked.
Ensure you have administrative access if you need to review Microsoft Entra sign-in logs, and save all your current work before making changes to the Windows Credential Manager.
Clear Stale Credentials and Reconnect Your Account
Removing outdated cached credentials is the most effective way to resolve authentication loops caused by expired or corrupted login tokens.
Windows stores login tokens in the Credential Manager. When these tokens become corrupted or out of sync with Microsoft Entra ID, background services like the OneDrive Sync Engine will repeatedly fail to authenticate, triggering endless pop-ups.
Click the Windows Start button, type 'Credential Manager' in the search bar, and select the application from the results.
Navigate to the 'Windows Credentials' tab. Scroll down and locate any entries starting with 'MicrosoftOffice', 'OneDrive', or 'msteams'. Click on the dropdown arrow next to each relevant entry and select 'Remove'.
Open Windows Settings, go to 'Accounts', and select 'Access work or school'. Find your Microsoft 365 account, click on it, and select 'Disconnect'.
Restart your computer. Open a Microsoft 365 application such as Word or Excel, and follow the prompt to sign in again. This forces the system to generate a fresh, uncorrupted authentication token.
Review Microsoft Entra Logs and Policies (For Admins)
IT administrators can use Microsoft Entra admin center to identify if Conditional Access policies, network issues, or suspicious activities are triggering the prompts.
Switch to WPS Office for a Hassle-Free Offline Experience
Tired of constant Microsoft 365 login prompts and cloud synchronization issues? WPS Office offers a robust, free alternative that lets you work completely offline without forced authentication loops. Enjoy a lightweight application that respects your local workflow.
- 1. Download the Installer: Click the download button on the official WPS website to get the latest version of WPS Office.
- 2. Install the Application: Run the lightweight installer and follow the simple on-screen instructions to set up the software.
- 3. Work Offline Immediately: Open your existing Microsoft files directly in WPS Office and start working right away without needing to sign in.
Frequently Asked Questions
Why does Microsoft 365 keep asking for my password even though it's correct?
This usually happens when the cached login token in the Windows Credential Manager becomes corrupted, expired, or out of sync with Microsoft Entra ID policies, forcing background services to repeatedly request a new token.
Can system network or time settings cause Microsoft 365 sign-in issues?
Yes. If your computer's system clock is out of sync with the Microsoft authentication server, or if a firewall/VPN is blocking access to Microsoft's login endpoints, the silent authentication process will fail and prompt you repeatedly.
Does the OneDrive Sync Engine cause Office login loops?
Yes, because OneDrive and Office share the same authentication tokens. If the OneDrive Sync Engine holds a stale credential, it can trigger continuous background authentication failures that manifest as login prompts across all Microsoft 365 apps.
What should I do if my account is not locked but I still cannot stop the prompts?
Go to Windows Settings under 'Access work or school', disconnect the problematic account, and restart your device. If the issue persists, contact your IT administrator to check for restrictive Conditional Access policies in Microsoft Entra.
