Clearing the Microsoft Office credential cache on Windows 11 fixes broken sign-in pop-ups, license verification failures, and account sync loops. Legacy techniques like purging old Control Panel entries are no longer sufficient for Modern Authentication. The modern procedure requires purging the digital identity tokens held within the Windows 11 Web Account Manager (WAM) alongside clearing the integrated Office authentication files.
Fast-Fix: The 45-Second Solution
This low-risk issue is caused by stale identity tokens or corrupt encryption keys within the Windows Web Account Manager (WAM) cache. Cloud documents are safe, though local Office apps will require re-signing in. To resolve it, terminate Office tasks, unregister your corporate account in Windows Settings, and purge the Microsoft.AAD.BrokerPlugin app data folder.
Diagnostic Snapshot
- Severity Tier: Low to Moderate (Causes intermittent password prompts or temporary application lockouts)
- Data Safety Risk: Zero Risk (Local document work remains intact; only login session tokens are deleted)
- Common Cause: Synchronized password changes, conditional access updates, or overlapping personal and work Microsoft profiles
- Admin Requirement: Standard user access for WAM and Credential Manager; Local Admin if repairing system-wide account configurations
Condition: Low Risk vs. High Risk
- Low Risk Scenario: A single desktop application like Outlook repeatedly asks for a password, but entering it allows work to continue for a few hours before the prompt reappears.
- High Risk Scenario: Every Microsoft 365 app errors out immediately upon launch, showing completely blank sign-in boxes or throwing strict verification failures that block local document modification entirely.
The System Break (What This Means)
Think of your Office credential cache as a security badge scanner at an office building’s turnstile. The desktop apps do not remember your password directly; they look at a temporary security badge issued by Windows 11.
When your password changes or your corporate cloud modifies its security criteria, that badge becomes demagnetized. Instead of throwing away the bad badge and asking for a new one, the local scanner keeps misreading the old tape. This causes the turnstile to jam, locking you out until you physically wipe the reader clean and pull a fresh badge.
Root Cause Probability
- Likely (65%): Outdated WAM Token Cache. The local identity plugin retains expired login tokens that clash with the modern Azure authentication engine.
- Possible (25%): Intersecting Profile Conflict. Personal OneDrive credentials conflict with a corporate Microsoft 365 enterprise account inside Windows Credential Manager.
- Rare (10%): Local Machine Certificate Expiration. The workplace join certificate issued to the physical machine has expired or been revoked on the company tenant database.
Conflict Escalators
Running the “New Outlook” toggle alongside classic desktop suites frequently mixes up the token cache paths. Similarly, connecting through restrictive corporate firewalls or corporate VPN tunnels that block background token refreshes accelerates cache expiration and corrupts local session handshakes.
Progression: 1 Hour → 24 Hours → 1 Week
- 1 Hour: Small warning icons show up in the corner of your Office apps. Syncing to shared cloud files slows down or pauses.
- 24 Hours: Frequent, blank pop-up windows appear and disappear, disrupting your active workflow and preventing changes from uploading to OneDrive.
- 1 Week: The apps enter a read-only state. You are completely blocked from modifying cloud documents locally until the authentication engine receives a clean reset.
Common Misdiagnoses
Users often confuse modern token corruption with a physical hardware security failure like Troubleshooting TPM 2.0 Errors (80090016) during Office Sign-in. While a TPM fault points to physical motherboard chip encryption failures, standard cache corruption is purely software-based. It is also completely different from tenant-side account blocks like “Your Organization Has Disabled This Device” (Error Code 135011), where your machine is explicitly shut down by an IT administrator in the cloud portal.
Immediate Action Steps
Step 1: Force Close All Microsoft 365 Apps
Open Task Manager (Ctrl + Shift + Esc). Locate and end any tasks running for outlook.exe, winword.exe, excel.exe, and teams.exe.
Step 2: Disconnect the Work or School Link
Open Windows Settings > Accounts > Access work or school. Locate the affected corporate email address, click it to expand the menu, and click Disconnect.
[Settings] ➔ [Accounts] ➔ [Access work or school] ➔ [Select Corporate Email] ➔ [Disconnect]
Step 3: Wipe Legacy Credential Manager Records
Type Credential Manager into the Windows search bar and open it. Click on Windows Credentials. Scroll down to the generic credentials section. Select and delete every entry that begins with MicrosoftOffice16_Data: or IdentityCache:.
Step 4: Clear the Modern WAM Plugin Cache Folder
Press Win + R to open the Run box. Paste the following path and press Enter:%localappdata%\Packages\
Locate the folder named exactly:Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy
Rename this folder to Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy.old. If Windows says files are in use, open Task Manager again and verify that the “Microsoft Sharepoint Document Cache” or “Microsoft Teams” background processes are completely stopped.
Step 5: Reboot and Re-authenticate
Restart your computer. Open Microsoft Word first, click Sign In in the top corner, and enter your account information. This forces Windows 11 to create a brand-new, clean token folder.
Hard-Stop Red Flags
Stop local manual troubleshooting immediately if you encounter either of these indicators:
- If clearing the cache leads directly to an unbreakable, repetitive authentication prompt detailed inside How to Break a Microsoft Authenticator MFA Loop (2025 Update).
- If you receive a flat notice stating that your user object no longer exists in the corporate database, meaning the account was deleted at the server level.
What the IT Admin Will Check
If flushing the local cache does not resolve the loop, an administrator must evaluate the corporate portal configuration:
- Conditional Access Evaluation: Confirm if specific policies are requiring too frequent authentication rounds or if token lifetime limits are clashing with local machine states.
- Modern Auth Pipeline Health: Look for broader token validation issues across the entire company network infrastructure as outlined in How to Resolve Modern Authentication (ADAL/MSAL) Failures in 2025.
Resolution Complexity
- User-Level Remediation: 10 minutes (Using Windows Settings, Credential Manager, and folder renaming).
- Admin Escalation: 20 minutes (If deploying automated PowerShell user-profile cache clearing scripts across an entire department).
Related Error Escalators
When the main credential cache fails to clear cleanly, it can manifest as isolated application bugs. For example, a broken token pipeline might cause specific software storage path errors like “We can’t get to your notebooks” OneNote Activation Error.
Ticket Closed
For standard sign-in loops on Windows 11, removing the old entries from the Windows Credential Manager and renaming the modern BrokerPlugin folder remains the gold standard for repair. It flushes out stuck encryption keys without risking your personal files, forcing the operating system to negotiate a brand-new, stable connection with the Microsoft 365 cloud.