Error: Something went wrong. [4vt9f]
Error code 4vt9f is a Microsoft Office sign-in and activation error. It happens in apps like Windows APP, Outlook, Word, or Excel when your login tokens become corrupted, your saved credentials are out of date, or the background sign-in service stops running.
*** These steps are performed on the user's workstation ***
Clear Corrupted Login Caches
- Close all of your Microsoft Office programs.
- Press the Windows Key + R to open the Run box.
- Type %localappdata%\Microsoft\OneAuth\blobs and press Enter.
- Delete all files inside that folder.
- Repeat this process for %localappdata%\Microsoft\OneAuth\accounts and %localappdata%\Microsoft\IdentityCache.
Enable the Sign-in Assistant Service
- Type services in the Windows search bar and open the Services app.
- Scroll down to find Microsoft Account Sign-in Assistant.
- Right-click it and choose Properties.
- Change the startup type to Automatic.
- Click Start if the service is not running, then click Apply and OK.
Clear Credential Manager
- Type credential manager in the Windows search bar and open it.
- Click on Windows Credentials.
- Look for any entries related to Office, OneDrive, or your Microsoft account, and click Remove.
- Restart your computer and sign back into your Microsoft 365 account.
