teams Code 80080300

How to Fix Microsoft Teams Error 80080300

Diagnostic Procedures

  • 1 Identify the exact meaning of the error code
  • 2 Clear cache or credentials related to the software
  • 3 Check service server status for outages
  • 4 Perform a repair or reset on the desktop client
  • 5 Re-authenticate the connection to sync files

How to Fix Microsoft Teams Error 80080300

If you are stuck on the Microsoft Teams login page with Error Code 80080300, your system’s Single Sign-On (SSO) engine is failing to process your security token. This is a common error on Windows devices when the client application is blocked from communicating with the Windows Web Account Manager (WAM).

This guide walks you through repairing the Windows authentication plugins, clearing cached credentials, and re-establishing a secure SSO session.

1. Identify the Exact Meaning of the Error Code

Error Code 80080300 indicates an internal failure within the Windows Web Account Manager (WAM) framework.

This issue typically occurs because:

  • Corrupted Broker Plugin: The Microsoft Entra ID Broker Plugin (Microsoft.AAD.BrokerPlugin) is registered incorrectly or is corrupted.
  • Stale Workplace Join Tokens: The local connection between Windows and your corporate Entra ID tenant is broken.
  • Multi-tenant SSO Conflict: Teams is attempting to sign in using default Windows credentials that do not match the expected tenant parameters.

Purging stored session states prevents the application from trying to use corrupted login keys.

A. On Windows (PowerShell)

  1. Close Microsoft Teams.
  2. Open PowerShell as Administrator and execute: 
    Stop-Process -Name "ms-teams" -Force -ErrorAction SilentlyContinue
Remove-Item -Path "$env:LOCALAPPDATA\Packages\MSTeams_8wekyb3d8bbwe\*" -Recurse -Force -ErrorAction SilentlyContinue
  3. Remove cached credentials from the system:
    • Open Credential Manager (via Start Menu).
    • Click Windows Credentials.
    • Remove all entries containing MicrosoftOffice16, MicrosoftTeams, or your work email address.

B. On macOS (Terminal)

Although 80080300 is primarily a Windows WAM error, macOS users experiencing corresponding SSO synchronization errors should clear cache and keychain:

pkill -9 "Microsoft Teams"
rm -rf ~/Library/Group\ Containers/UBF8T346G9.com.microsoft.teams
rm -rf ~/Library/Containers/com.microsoft.teams2

Delete references to “Microsoft Office” and “Microsoft Teams” in Keychain Access.

3. Check Service Server Status for Outages

  • Verify the Microsoft 365 Service Status Page to confirm Entra ID and Identity services are online.
  • If your organization has recently migrated domains, contact your IT administrator to verify that your user account’s User Principal Name (UPN) is synced with the identity provider.

4. Perform a Repair or Reset on the Desktop Client

To resolve the core WAM issue on Windows, you must re-register the Entra ID authentication package.

A. Re-register the AAD Broker Plugin (Windows)

  1. Right-click the Start Menu and select PowerShell (Admin).
  2. Run the following command to re-register the Broker Plugin: 
    Add-AppxPackage -Register "$env:windir\SystemApps\Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy\AppxManifest.xml" -DisableDevelopmentMode -ForceApplicationShutdown
  3. Restart your computer.

B. Reset Teams Package Configuration (Windows)

If re-registering the plugin does not work, reset the Microsoft Teams app:

Get-AppxPackage -Name "MSTeams" -AllUsers | Reset-AppxPackage

5. Re-authenticate the Connection to Sync Files

Reconnecting your work account refreshes the security token binding with Windows.

  1. Open Settings (Win + I).
  2. Navigate to Accounts → Access work or school.
  3. Select your work account and click Disconnect.
  4. Restart your PC.
  5. Return to Access work or school, click Connect, and re-authenticate. Ensure you check “Allow my organization to manage my device” when signing in.
  6. Launch Microsoft Teams and complete the login.

B. Force Sign-out (macOS)

  1. Open Microsoft Teams, click your profile icon, and select Sign Out.
  2. Relaunch Teams and type your username and password manually.

6. Summary Quick Reference Checklist

Troubleshooting TargetOperationExpected Outcome
WAM Broker Re-registerRun Add-AppxPackage command in Admin PowerShellFixes broken Windows identity broker plugins.
Account DisconnectionDisconnect and reconnect under “Access work or school”Refreshes the system-wide device token.
App Cache PurgeDelete %localappdata%\Packages\MSTeams_8wekyb3d8bbweForces Teams to request a fresh token from WAM.
Windows CredentialsDelete MicrosoftOffice16/MicrosoftTeams entriesRemoves stale, stored credentials.
Verify time synchronizationRight-click Windows clock -> click Sync NowPrevents time-skew token validation blocks.