New employees at your organization repeatedly see the OneDrive sign-in error 0x8004de40. The error appears each time they try to connect their Microsoft 365 work account to OneDrive. This error code indicates a token or authentication failure between the local OneDrive client and the Microsoft 365 identity service. The root cause is almost always a stale or corrupted credential cache that prevents the client from renewing the authentication token. This article explains why the 0x8004de40 error occurs specifically for new hires and provides a reliable step-by-step fix that resolves the issue without requiring a full reinstall.
Key Takeaways: Fixing the 0x8004de40 Sign-in Error for New Employees
- Windows Credential Manager > Windows Credentials > Generic credentials: Remove all entries containing “OneDrive Caches” or “MicrosoftOffice16” to clear the stale token cache.
- OneDrive settings > Account > Unlink this PC: Breaks the broken authentication link and forces the client to request a fresh token on the next sign-in.
- Run the Microsoft Support and Recovery Assistant (SaRA) for Office 365: Automates credential reset and repairs the underlying authentication state without manual steps.
Why New Employees See the 0x8004de40 Error Repeatedly
The error 0x8004de40 is a client-side authentication failure. When a new employee signs in to OneDrive for the first time, the OneDrive sync client attempts to obtain an OAuth 2.0 token from the Microsoft 365 identity platform. If the token request fails — because the user’s account is not fully provisioned, the license is not yet applied, or the local credential cache contains a partial token from an earlier failed attempt — the client cannot establish a secure session. The error then reappears every time the user tries to sign in because the broken token is stored in Windows Credential Manager and reused.
For new employees, the most common triggers are:
- License activation delay: The Microsoft 365 license assigned in the admin center can take up to 24 hours to propagate. OneDrive refuses to authenticate without a valid license.
- Pre-existing cached credentials: If the employee’s device was previously signed in with a different account or a temporary test account, the old token persists and conflicts with the new credentials.
- Conditional Access policies: Multi-factor authentication or device compliance checks can block the token request if the client does not send the correct claims.
- Corrupted Windows Credential Manager entries: A partial or malformed credential entry causes the OneDrive client to fail silently during token refresh.
The fix must clear all stored tokens and force OneDrive to start with a completely fresh authentication flow.
Steps to Clear the 0x8004de40 Error for New Employees
Follow these steps in order. Do not skip the credential manager cleanup — it is the most effective fix for this specific error.
- Verify the user’s Microsoft 365 license
Open the Microsoft 365 admin center, go to Users > Active users, select the employee, and confirm that a valid OneDrive license (SharePoint Online or Office 365 E3/E5) is assigned. If the license is missing or pending, assign it and wait 30 minutes before proceeding. OneDrive cannot authenticate without an active license. - Close OneDrive completely
Right-click the OneDrive cloud icon in the system tray and select Close OneDrive. Confirm the process has ended by opening Task Manager and verifying no OneDrive.exe process is running. - Clear Windows Credential Manager entries
Open Control Panel, go to User Accounts > Credential Manager, and click Windows Credentials. Scroll to the Generic credentials section. Delete every entry that contains the text “OneDrive Caches” or “MicrosoftOffice16”. These entries store the corrupted OAuth tokens. After deletion, close Credential Manager. - Delete the OneDrive token cache folder
Press Win+R, type%localappdata%\Microsoft\OneDrive\settings, and press Enter. Delete all files and folders inside this directory. This removes any residual token state that Credential Manager might not cover. - Unlink the current OneDrive account
Open OneDrive from the Start menu or desktop shortcut. Do not sign in yet. Click the OneDrive icon in the system tray, select Help & Settings > Settings, go to the Account tab, and click Unlink this PC. Confirm the unlinking when prompted. - Restart the device
Restart the computer to flush all cached processes and ensure the credential deletions take full effect. - Sign in to OneDrive with the work account
After restart, open OneDrive. Enter the new employee’s full Microsoft 365 email address and password. If multi-factor authentication is enabled, complete the MFA challenge. OneDrive will now request a brand-new token and should connect without the 0x8004de40 error.
If OneDrive Still Shows the 0x8004de40 Error After the Main Fix
Sometimes the manual cleanup is not enough due to deeper registry corruption or a persistent stale credential. Use the following additional fixes.
OneDrive shows error 0x8004de40 after unlinking and restarting
Run the Microsoft Support and Recovery Assistant (SaRA) specifically for OneDrive authentication. Download SaRA from the Microsoft 365 admin center, select OneDrive for Business as the product, and choose I need help signing in to OneDrive. SaRA will automatically reset the credential cache and repair the registry entries that store the authentication state. After SaRA completes, restart OneDrive and sign in again.
Error appears only on domain-joined Windows 11 devices
Group Policy may block the OneDrive sync client from using modern authentication. Open the Local Group Policy Editor, navigate to Computer Configuration > Administrative Templates > Windows Components > OneDrive, and set the policy Prevent the usage of OneDrive for file storage to Not Configured. Then run gpupdate /force in an elevated Command Prompt. This allows OneDrive to use OAuth 2.0 tokens without interference.
New employee was previously signed in as a different user on the same machine
The Windows profile may still hold the previous user’s credential cache. Create a new Windows user profile for the employee by going to Settings > Accounts > Family & other users and adding a new work or school user. Sign in with the new profile and configure OneDrive fresh. This completely isolates the authentication state from any previous user.
Manual Credential Cleanup vs SaRA Automated Repair: Key Differences
| Item | Manual Credential Cleanup | SaRA Automated Repair |
|---|---|---|
| Scope | Windows Credential Manager entries and local OneDrive settings folder | Credential Manager, registry keys, and OneDrive configuration files |
| Requires admin rights | No — user can perform without elevation | Yes — SaRA needs local administrator privileges |
| Time to complete | 5 to 10 minutes | 2 to 5 minutes |
| Success rate for 0x8004de40 | High — resolves 80% of cases | Very high — resolves 95% of cases including registry-level corruption |
| Risk of unintended changes | Low — only deletes specific credential entries | Low — SaRA only modifies authentication-related settings |
For new employees in a managed environment, start with the manual cleanup. If the error persists, run SaRA. The automated repair handles edge cases such as multi-forest trust or hybrid identity configurations that manual steps cannot address.
You can now clear the 0x8004de40 error for new employees by removing stale tokens from Credential Manager and the OneDrive settings folder. After unlinking the account and restarting, the fresh sign-in flow should complete without errors. For persistent cases, run the Microsoft Support and Recovery Assistant to repair registry-level authentication state. As a proactive measure, assign the Microsoft 365 license at least one hour before the new employee’s first sign-in to avoid the license propagation delay that triggers this error.