I cannot open my teams app

Question

Whenever I try open Teams on my Mac through the desktop app it crashes. I have tried deleting and re-loading the app a number of times but have no luck.

Answer 1

Dear @TDC Global,

Thank you for reaching out to the Microsoft 365 Q&A forum. I understand how frustrating it is when the Teams app repeatedly crashes on your Mac, especially after you have already attempted to reinstall it multiple times. Since a standard reinstallation often leaves behind hidden configuration files that can cause these crashes, the most effective solution is to perform a manual cache reset and check for specific policy conflicts. 

Here is a step-by-step guide to resolving the crashing issue on macOS: 

Step 1: Request an IT Admin Check of Sign-in Logs 

(If you're a user, you'll need to ask your global administrator to perform this step.) 

Before troubleshooting the software locally, it is important to rule out server-side blocks. 

• Action: Ask your IT Administrator to review your Microsoft Entra ID sign-in logs. 
• Go to Entra ID > monitoring and health > login logs. To use sign-in logs more efficiently in the Microsoft Entra admin center, adjust the filters to show only specific logs. For more information, see Filtering login logs. 
• The logs show the policy blocking PC logins and the specific "reason for failure". 
• These logs will reveal if a specific security policy (like a Conditional Access policy) is causing the app to fail or crash during the authentication handshake. 

Official Reference: Sign-in logs in Microsoft Entra ID. 

Step 2: Check macOS compatibility 

Confirm that your version of Teams is compatible with macOS Sonoma. Some users have reported issues with Teams on this macOS version. If possible, consider downgrading the macOS or using an earlier version of Teams that is known to be stable. 

Official Microsoft documentation Can't Sign in to Teams for Mac after macOS Upgrade - Microsoft Teams | Microsoft Learn 

Step 3: Verify Access on the Web

Please try deleting and restarting your computer and then try again on Teams web:

• Open a browser (Chrome or Edge) and try to sign in to the Teams Web.
• If the web version works, it confirms your account is active and the problem is strictly with the local desktop environment or its interaction with your macOS settings.

Step 4: Safe Mode 

Boot your Mac in Safe Mode and try to open Teams. If it works, there might be an issue with another program or service running in the background. 

Ensure your Mac is running the latest updates. Sometimes system updates can fix compatibility issues with applications. 

For more details, please refer to: Teams doesn't load - Microsoft Teams | Microsoft Learn 

Resolve issues when starting the new Teams app - Microsoft Teams | Microsoft Learn 

Hope this helps get your Teams app running smoothly again. If you still have problems after trying these, please provide more details about any error messages you're receiving or other behaviors you're experiencing.

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Answer 2

If the Teams app is crashing on your Mac, here are some troubleshooting steps you can try:

1. Clear Teams Cache: Sometimes, clearing the cache can resolve issues with the app. To do this:
   • Quit the Teams app.
   • Open Terminal from the Applications/Utilities folder.
   • Enter the following commands:

          rm -rf ~/Library/Group\ Containers/UBF8T346G9.com.microsoft.teams
          rm -rf ~/Library/Containers/com.microsoft.teams2
     

   • Restart Teams.
2. Check for Updates: Ensure that you are using the latest version of the Teams app. You can check for updates in the app or download the latest version from the Microsoft website.
3. Reinstall Teams: Since you've already tried reinstalling, ensure that you completely remove all associated files before reinstalling. After uninstalling, check for any leftover files in the Library folders and delete them before reinstalling.
4. Check System Requirements: Make sure your macOS version is compatible with the latest version of Teams. If your OS is outdated, consider updating it.
5. Network Configuration: Ensure that your network configuration allows Teams to connect. Sometimes, firewall or proxy settings can block the app from functioning properly.

If these steps do not resolve the issue, you may want to reach out to Microsoft Support for further assistance.

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References:

• Teams keeps crashing and reloading - Microsoft Q&A
• Resolve Teams client launch failures