Troubleshoot Microsoft Office Error Code 5fcl8: Effective Solutions

Encountering Microsoft Office error code 5fcl8? This guide offers practical solutions to resolve this issue, which often manifests as "Something went wrong" when accessing applications like Word or Excel. The error typically stems from authentication problems with Microsoft 365, Azure Active Directory (AAD), or the Web Account Manager (WAM) plugin.

Potential causes include:

• Corrupted authentication data: Damaged OneAuth or IdentityCache folders storing login information.
• Network connectivity problems: Firewall restrictions or conflicts with dual graphics cards.
• System-level issues: Corrupted registry entries or files interfering with license verification.

Solutions to Fix Error Code 5fcl8:

Method 1: Close Office Processes

Malfunctioning Office applications can trigger this error. Closing them might resolve the problem:

1. Right-click the taskbar and select "Task Manager."
2. Locate and end any running Office processes (Word, Excel, etc.).
3. Check if the error is resolved. If not, proceed to the next solutions.

Method 2: Clear Notifications Registry Key (RDS/Citrix Environments)

Registry issues with notifications can sometimes cause authentication failures, especially in virtualized environments. Clearing this key might help:

1. Press Win R to open the Run dialog.
2. Type regedit and press Enter to open Registry Editor.
3. Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Notifications
4. Right-click the "Notifications" key and select "Delete."
5. Restart your computer and try signing into Office again.

Method 3: Clear OneAuth and IdentityCache Folders

A corrupted certificate cache can prevent account verification. Deleting these folders forces Office to recreate them:

1. Close all Office applications.
2. Press Win R, type %AppData%\Microsoft, and click "OK."
3. Locate and delete the "OneAuth" and "IdentityCache" folders.
4. Restart your computer and attempt to log in to Office.

Method 4: Repair Web Account Manager Components

Problems with the WAM plugin can cause this error. Repairing it may resolve the issue:

1. Search for "PowerShell," right-click, and select "Run as administrator."
2. Execute the following commands (press Enter after each):

add -appxpackage -register $env:windir\systemapps\microsoft.aad.brokerplugin_cw5n1h2txyewy\appxmanifest.xml -disableDevelopmentMode -forCeapplicationsHutdown
add -appxpackage -register $env:windir\systemapps\microsoft.windows.cloudexperienceHost_cw5n1h2txyewy\appxmanifest.xml -disableDevelvementMode -forceapplicationshutdownhutdown

3. Restart your PC and check for the error.

Additional Troubleshooting Steps:

• Verify Microsoft account information.
• Ensure Office is updated to the latest version.
• Run SFC and DISM scans (sfc /scannow and DISM /Online /Cleanup-Image /RestoreHealth).
• Reinstall Microsoft Office.

Important Note: Before attempting any of these solutions, consider backing up your important Microsoft Office data to a safe location using a reliable backup solution. This precaution protects your files in case of unforeseen complications.

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