OneDrive Admin Checklist: 0x8004de40 sign-in error keeps returning for new employees

New employees at your organization repeatedly see error code 0x8004de40 when they try to sign in to OneDrive. The error message states that the sign-in cannot proceed, and it appears even after the user enters correct credentials. This error is caused by a mismatch between the local Windows credential manager cache and the authentication tokens that OneDrive expects from Microsoft 365.

The root cause is almost always a stale or conflicting credential entry left behind from a previous user session on the same computer, or a misconfigured tenant setting that prevents new users from authenticating properly. This article provides a step-by-step admin checklist to permanently resolve error 0x8004de40 for new employees and prevent it from returning.

You will learn how to clear credential caches, verify tenant sync policies, and apply a permanent fix that works across all Windows devices in your organization.

Why Error 0x8004de40 Occurs for New Employees

Error 0x8004de40 is an authentication failure that appears when OneDrive cannot validate the user’s identity with Microsoft 365 servers. The technical cause is a mismatch between the token stored in the local Windows Credential Manager and the token that the Microsoft 365 authentication endpoint expects. For new employees, this typically happens because the computer was previously used by another person whose credentials remain cached.

When a new user attempts to sign in, OneDrive reads the old cached credentials and sends them to the Microsoft 365 sign-in service. The service detects that the credentials do not match the current user’s identity and returns error 0x8004de40. The same error can also occur if the organization’s Conditional Access policy requires device compliance or multi-factor authentication, and the new employee’s device has not been registered properly.

Admin Checklist to Fix Error 0x8004de40 Permanently

Follow these steps in order. Do not skip any step. Each step addresses a specific cause of the error.

1. Sign out of OneDrive completely
   Right-click the OneDrive cloud icon in the notification area and select Help & Settings > Settings. Go to the Account tab and click Unlink this PC. Confirm the unlinking. Close the OneDrive window.
2. Clear Windows Credential Manager entries
   Open Control Panel and go to User Accounts > Credential Manager > Windows Credentials. Under Generic Credentials, find and remove all entries that contain “MicrosoftOffice16” and “OneDrive Cached Credential”. Also remove any entry with the user’s old email address. Close Credential Manager.
3. Reset OneDrive sync client
   Press Windows key + R, type %localappdata%\Microsoft\OneDrive\onedrive.exe /reset, and press Enter. Wait 30 seconds. If OneDrive does not restart automatically, press Windows key + R again, type the same command without /reset, and press Enter. This clears all cached sync data.
4. Verify tenant sync policy in Microsoft 365 admin center
   Go to admin.microsoft.com > Settings > Org settings > OneDrive > Sync. Ensure the option “Allow syncing only on PCs joined to specific domains” is either disabled or includes the new employee’s device domain. Also confirm that “Allow syncing of OneDrive files on PCs not joined to domains” is enabled if the device is not domain-joined.
5. Check Conditional Access policies
   In the Microsoft 365 admin center, go to Endpoint > Conditional Access > Policies. Look for any policy that requires device compliance or multi-factor authentication for OneDrive. If the new employee’s device is not enrolled in Microsoft Intune or Azure AD Join, the policy will block authentication. Either enroll the device or create an exclusion policy for new employees during onboarding.
6. Sign in to OneDrive again
   Open OneDrive from the Start menu. Enter the new employee’s Microsoft 365 email address and password. Complete multi-factor authentication if prompted. OneDrive should sync without error 0x8004de40.

If OneDrive Still Shows Error 0x8004de40 After the Main Fix

Some environments require additional steps. Use the following sub-sections based on your organization’s configuration.

OneDrive error 0x8004de40 after password reset

If the employee recently reset their password, the old password hash remains in the Windows Credential Manager. Repeat steps 1 through 3 of the main checklist. Ensure you remove all entries under Generic Credentials that contain the old email address. Then ask the user to sign in with the new password.

OneDrive error 0x8004de40 on Azure AD Joined devices

Devices joined to Azure AD may still have stale Primary Refresh Tokens. Open Command Prompt as administrator and run dsregcmd /leave. Restart the computer. The device will automatically re-join Azure AD on next sign-in. Then run dsregcmd /status to confirm the device state is clean. After that, repeat the main checklist steps 1 through 6.

OneDrive error 0x8004de40 with third-party security software

Some antivirus or endpoint protection software blocks the OneDrive authentication process. Temporarily disable the security software and attempt the sign-in again. If the error disappears, add an exclusion for %localappdata%\Microsoft\OneDrive\ and C:\Users\%username%\OneDrive in the security software settings.

Item	Manual Credential Clear	Automated Script Clear
Description	Admin manually removes stale credentials via Credential Manager UI	Admin runs a PowerShell script to delete all MicrosoftOffice16 and OneDrive cached credentials
Time per user	5-10 minutes	30 seconds
Risk of error	Low if admin follows checklist	Low if script targets only MicrosoftOffice16 and OneDrive entries
Best for	One-off fixes for individual employees	Bulk onboarding of multiple new employees

Error 0x8004de40 for new employees is now resolved by following this admin checklist. After clearing credentials and verifying tenant policies, the sign-in process completes without interruption. To prevent recurrence, consider deploying a Group Policy Object that automatically removes stale credential entries during user logoff. For ongoing management, run the PowerShell script cmdkey /list | Where-Object {$_ -match "MicrosoftOffice16"} | ForEach-Object {cmdkey /delete:$_} as a scheduled task on shared devices.