How to fix
Microsoft Teams error tag 4vlpo
on Windows

I’m on Windows 11 and keep getting an "Error Tag: 4vlpo" message when signing into Microsoft Teams. It says "Something went wrong," and I can’t log in. Restarting didn’t work - how do I fix this?

Microsoft Teams is a critical tool for communication and collaboration, enabling Windows 11 users to engage in meetings, share files, and coordinate with colleagues seamlessly. However, Error Tag 4vlpo can disrupt this functionality, particularly during the sign-in process.

Users encounter a scenario where the application prompts for credentials, only to display a vague “Something went wrong” message accompanied by the 4vlpo error code, preventing access. For this individual on Windows 11, a system restart - an initial troubleshooting step - failed to correct the issue, indicating a more persistent underlying cause.

This disruption hinders productivity, as users are unable to join scheduled calls or access shared resources. The error often stems from authentication or connectivity problems, with several potential origins:

• Authentication failures. A glitch in Microsoft 365 identity validation might block access.
• Network instability. Weak connections can disrupt Teams’ server handshake.
• Corrupted app data. Stale cache or credentials could stop the login process.
• System conflicts. Windows services or updates might clash with Teams.
• Server-side issues. Microsoft’s servers could be temporarily down.

Since the root isn’t always obvious, cracking Error Tag 4vlpo might mean testing multiple fixes below. Tools like [d1] can also step in to tackle underlying Windows issues that might quietly fuel the problem, offering a lifeline to get Teams running smoothly again.

Fix 1. Verify network stability

Windows 11

• Type Troubleshoot in Windows search and hit Enter.
• Select Other troubleshooters.
• Locate Network & Internet troubleshooter from the list and click Run.
• Wait till the process is finished and apply the recommended fixes.
• Restart your computer.

Run Network troubleshooter in Windows 10

• Right-click on Start and pick Settings.
• Go to the Network & Internet section.
• On the right side, find the Advanced network settings section.
• Click Network troubleshooter and wait.
• The fixes will be automatically applied.

Fix 2. Clear Teams cache

Accumulated application data may interfere with login operations, potentially causing error 4vlpo—removing it offers a fresh start.

• Press Win + E to open File Explorer.
• Ensure Hidden files are visible.
• In the address bar, type in %appdata%\Microsoft\teams and press Enter.
• Delete the contents of the following folders:
  %appdata%\Microsoft\teams\application cache\cache
  %appdata%\Microsoft\teams\blob_storage
  %appdata%\Microsoft\teams\Cache
  %appdata%\Microsoft\teams\databases
  %appdata%\Microsoft\teams\GPUcache
  %appdata%\Microsoft\teams\IndexedDB
  %appdata%\Microsoft\teams\Local Storage %appdata%\Microsoft\teams\tmp
• Make sure you empty the Recycle Bin (or use Shift + Del combination to delete these files).
• Restart your computer.

Fix 3. Sign Out and re-authenticate

• Open Microsoft Teams.
• Click on your profile icon and select Sign out.
• Close the application.
• Reopen Microsoft Teams and sign in with your credentials.

Fix 4. Update Teams and Windows

Outdated software versions may introduce compatibility problems, ensuring updates are installed can mitigate this risk.

• Type Updates in Windows search and hit Enter.
• If updates are available, click Install updates.
• Otherwise, click Check for updates.
• If optional updates are available, install them as well.
• When all the update processes are complete, restart your computer.

Update Teams:

• Open Microsoft Teams.
• Click on the Settings and more button at the top-right corner.
• Select Check for updates.
• Teams will automatically download and install any available updates.
• Restart Teams after the update is completed.

Fix 5. Reinstall Teams

• Type Control Panel in Windows search and press Enter.
• Go to Programs > Uninstall a program.
• Find Microsoft Teams, right-click, and select Uninstall.
• Follow the prompts to remove the app.
• Once done, press Win + E to open File Explorer.
• In the View tab at the top of the window, enable Hidden Files.
• Go to C:\Program Files\WindowsApps location.
• Scroll down to find the Microsoft Teams folder and delete it (alternatively, you can rename it).
• Now type %AppData% in Windows search and press Enter.
• Delete the Teams folder here.
• Finally, restart your system and reinstall the app.

Fix 6. Adjust Proxy Settings

Incorrect proxy configurations can disrupt Teams’ ability to connect to servers, potentially triggering Error 4vlpo.

• Type inetcpl.cpl in Windows search and press Enter.
• Go to the Connections tab and click on LAN settings.
• Make sure that Automatically detect setting is checked and Use a proxy server for your LAN is unchecked.

Fix 7. Check for file corruption

• Type cmd in Windows search, right-click on Command Prompt, and select Run as administrator.
• When UAC shows up, click Yes.
• Copy and paste the following command, pressing Enter after:
  sfc /scannow
• Wait till the scan is finished. If Windows finds system file integrity violations, it will attempt to fix them. After this, use the set of the following commands, pressing Enter each time:
  DISM /Online /Cleanup-Image /CheckHealth
  DISM /Online /Cleanup-Image /ScanHealth
  DISM /Online /Cleanup-Image /RestoreHealth
• Close down the Command Prompt and restart your system.

Fix 8. Reset Teams via PowerShell

• Type PowerShell in Windows search.
• Right-click on PowerShell and select Run as administrator.
• When UAC shows up, click Yes.
• Type the following command and press Enter:
  Get-AppxPackage Teams | Remove-AppxPackage
• Reinstall Teams by downloading it from microsoft.com/teams.
• Launch the app and sign in with your credentials.