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Fix Microsoft Teams Changing Work Email from .COM to .NET on Sign-in
Question details
Users are unable to authenticate into Microsoft Teams because the application automatically alters the work email address domain during the login process.
- Product
- Microsoft Teams
- Device & OS
- not provided
- Scenario
- Signing into the desktop application with a corporate or school email account.
- Observed behavior
- The email domain is automatically changed from .com to .net when attempting to sign in, which results in an immediate authentication failure.
Verify that your account credentials are correct by attempting to sign in to Teams for the web (teams.microsoft.com) via your browser to ensure this is an app-specific issue.
Clear the Microsoft Teams Cache
Clearing the desktop client cache forces Teams to remove corrupted local login data that may be causing the unwanted domain change.
Old account configurations or cached credentials can sometimes conflict with your current organization settings, prompting Teams to auto-fill an incorrect domain suffix.
Right-click the Microsoft Teams icon in your system tray at the bottom right of your screen, and select 'Quit' to close it completely.
Press the Windows Key + R to open the Run dialog box. Type '%appdata%\Microsoft\Teams' and press Enter. For the New Teams app, use '%localappdata%\Packages\MSTeams_8wekyb3d8bbwe' instead.
Select all files and folders within this directory and delete them. This will not delete your chat history or files stored on the server.
Relaunch the Microsoft Teams application and manually type your correct .com email address to sign in.
Manage Accounts on Domain-Joined Devices
Disconnecting conflicting work or school accounts from your Windows settings can prevent Teams from assuming the wrong organizational domain.
Reset or Reinstall Microsoft Teams
If clearing the cache does not resolve the issue, resetting the app or performing a clean installation will provide a fresh configuration.
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Frequently Asked Questions
Why does Microsoft Teams automatically alter my email domain?
This usually happens when there are cached credentials from a previous login, or your device is domain-joined to an organization network that forces a specific Azure Active Directory configuration during the Single Sign-On (SSO) process.
Will clearing my Teams cache delete my conversation history?
No. Clearing the Teams cache or resetting the application only removes temporary local data and login preferences. All your chats, channels, and shared files are saved in the cloud and will sync automatically once you sign back in.
How can I check if this is an issue with my account or just the desktop app?
You can isolate the problem by logging into Teams for the web (teams.microsoft.com) using an incognito or private browsing window. If you can sign in with your .com email address successfully, the issue is strictly with the desktop application's local cache or configuration.
