Installing Teams Infinite Loop

Hi @Cathal Moss, 

Good day to you. 

Thank you for reaching out, I truly appreciate you taking the time to share the details and the troubleshooting steps you’ve already tried.  

Based on what you described. This behavior typically points to an issue with the sign-in components Teams relies on such as cached credentials/tokens, local app data, or the embedded web sign-in experience rather than the installer itself. That’s why uninstalling/reinstalling doesn’t always resolve it. 

Please try the steps below in order: 

Step 1: Fully quit Teams and clear Teams cache/local data (Windows) 

1. Close Teams completely (right-click the Teams icon in the system tray > Quit). 
2. Press Windows + R, paste the following, then press Enter: 
3. %userprofile%\appdata\local\Packages\MSTeams_8wekyb3d8bbwe\LocalCache\Microsoft\MSTeams 
   
4. Delete all files and folders in the directory. 
5. Restart your computer then open Teams and try signing in again. 

Additional guidance (Including MacOS environment): Clear the Teams client cache - Microsoft Teams | Microsoft Learn 

Step 2: Remove saved work credentials 

1. Open Control Panel > Credential Manager > Windows Credentials. 
2. Remove any entries related to Microsoft/Teams/Office/ADAL/Azure (examples: MicrosoftOffice…, Teams…, ADAL…, Azure…). 
3. 
4. Restart the computer and attempt Teams sign-in again. 

Step 3: Disconnect and re-add your Work/School account (if applicable) 

1. Go to Settings > Accounts > Access work or school. 
2. If your work account is listed, select it and click Disconnect. 
3. 
4. Restart your computer. 
5. Add the work account back on the same page, then open Teams and try again. 

Step 4: Check the embedded sign-in component  

Teams uses a web-based sign-in flow in the background. If the embedded sign-in component is outdated or corrupted, it can cause loops/crashes. 

• Ensure Microsoft Edge is up to date. 
• If your organization manages devices, please ask IT to confirm Microsoft Edge WebView2 Runtime is installed and updated. 
• Restart after updates and test Teams again. 

Step 5: Contact your IT 

If the issue still continues after these checks, I recommend reaching out to your IT Admin and ask them to verify your organization’s Conditional Access/MFA settings, Intune/MDM device compliance requirements, Entra ID sign-in logs (to confirm whether sign-ins are being blocked or token issuance is failing), and any proxy/SSL inspection configurations that could be interrupting the sign-in flow. 

IT admins can refer to this article: Troubleshooting sign-in problems with Conditional Access - Microsoft Entra ID | Microsoft Learn 

In case the issue becomes more complex or your IT admins unable to access the necessary information, your admin can open a Microsoft Support ticket through the Microsoft Admin Center so Microsoft can review the detailed authentication traces and logs. They have access to system-level diagnostics and can investigate the problem more thoroughly. At the very least, they can provide the most effective workaround to ensure your experience remains smooth and secure.   

As community moderators, we appreciate your understanding that we do not have access to the administrative tools or permissions required to investigate or modify these configurations. We also do not have the capability to initiate remote sessions for direct assistance. Our role is to guide users to the appropriate resources and support channels.  

I hope this information is helpful. Should you have any further questions or need additional assistance, feel free to reach out.   

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Use the status code shown at the bottom-left of the Teams window to narrow down the cause, then apply targeted troubleshooting and involve the admin where required.

1. Note the status code and contact the admin

• When the desktop app loops and crashes, look at the status code in the lower-left corner of the Teams window (for example, 0xCAA20003, 0xCAA70007, 0xCAA90018).
• Provide this code to the IT admin. Many sign-in issues can only be fixed by the admin (for example, authorization problems, Entra ID policies, or sign-in restrictions).

2. Check basic connectivity and credentials

• If the status code indicates network or server issues (such as 0xCAA70007, 0xCAA82EE2, 0xCAA82EE7), verify that the device is connected to the internet and that no firewall, proxy, or network-sniffing tool is blocking Teams.
• If the status code indicates credential issues (such as 0xCAA90018), ensure the correct Microsoft 365 work account and password are used, not Windows or personal credentials.

3. Try alternate access paths

• Use the web version at https://teams.microsoft.com to confirm that the account itself works.
• If using the desktop app, also try the mobile app or another device to isolate whether the problem is specific to the current machine.

4. Restart and reinstall with full cleanup

• Fully quit Teams (right-click the Teams icon in the taskbar and select Quit) and restart it.
• If the issue persists, uninstall Teams.
• After uninstalling, delete remaining Teams-related data under the user profile (for example, under %appdata%/Microsoft/Teams and other Teams folders in AppData) before reinstalling, as leftover files can cause repeated crashes.
• Reinstall Teams and sign in again.

5. Check for admin policies and environment constraints

• If the organization uses sign-in restrictions or special environments (such as VDI), the admin may have policies that affect the new Teams client or sign-in behavior. The admin should verify:
  • No sign-in restrictions are blocking the device.
  • The OS version meets the minimum requirements for the Teams desktop app.
  • Any Group Policy or security tools are not preventing Teams from running.

If, after these steps, the desktop app still loops and crashes while web and mobile work, the admin should collect logs and escalate through Microsoft support using the status code and crash details.

References:

• Why am I having trouble signing in to Microsoft Teams?
• I can't reconnect to Microsoft Teams
• Resolve the new Teams client installation issues
• Teams for Education is not working
• Latest Teams Desktop Version getting auto restart, very strange issue. teams not working completely for desktop version. - Microsoft Q&A
• Teams continuously crashing in WIN 11 - Microsoft Q&A
• Teams keeps crashing and reloading - Microsoft Q&A
• Teams keeps crashing and restarting after updating to version 25332.1210.4188.1171 - Microsoft Q&A
• Can't sign in to microsoft 365 desktop apps - Microsoft Q&A