How to fix Teams not opening on Mac?

To fix the issue with Microsoft Teams not opening on your Mac, you can try the following steps:

1. Check for Unsupported OS Version: Ensure that your macOS version is supported by Microsoft Teams. You may need to update your operating system if it is not compatible.
2. Remove Existing Teams Files: Since you've already tried reinstalling, ensure that all related files are completely removed. This includes:
   • Quit all Office applications.
   • Go to Finder > Applications and delete Microsoft Teams.
   • Navigate to ~/Library/Containers/ and delete any folders starting with com.microsoft.Teams.
   • Check ~/Library/Application Support/ for any Teams-related folders and delete them.
3. Reinstall Teams: After removing all related files, download and install the latest version of Microsoft Teams directly from the Microsoft website.
4. Check for Antivirus or DLP Interference: If you have any antivirus or data loss prevention (DLP) tools, ensure they are not blocking Teams. You can refer to the guidance on including Teams in your antivirus settings.
5. Enable Windows Error Reporting (WER): If applicable, enabling WER can help identify the root cause of the issue and report it to Microsoft.
6. Check for Crash Reports: If the problem persists, analyze the crash reports for any specific errors that could provide more insight into the issue. You can also consider contacting Microsoft Support for further assistance.

If these steps do not resolve the issue, you may need to explore further troubleshooting or reach out to Microsoft Support directly.

References:

• Resolve Teams client launch failures
• Prevent antivirus and DLP tools from blocking or crashing Microsoft Teams

Dear @HS,

Thank you for posting your question in the Microsoft Q&A forum.

I totally understand your situation and based on your description, since Apple‑silicon Macs running macOS Ventura, this issue can happen if a Teams in‑app update doesn’t complete cleanly

First, I recommend you check the hardware configuration. For more details about hardware configuration requirements in Teams, you could refer to this link here: Teams client system requirements

Secondly, you can try creating a new user profile on your Mac and installing Teams there to see if the issue occurs on the new profile as well. You could refer to the link here: Add a user or group on Mac

Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

If the issue still persists, since you’re signing in with both a university (education) account and a work account, this issue will need to be handled by the administrators who manage those environments.

I recommend contacting your school IT administrator for the education account and your organization’s IT administrator for the work account. They can validate the account configuration, review device and application policies, and create a Microsoft Support ticket on your behalf if needed. This is the most effective way to proceed, as Microsoft Support requires the tenant owner or IT admin to submit and manage cases related to managed (education or business) accounts. For reference: Get support for Microsoft 365 for business

In the meantime, please continue to use Teams on the web and mobile to access both your university and work accounts.

Note: Please understand that as a forum moderator, my role is to provide general guidance and troubleshooting support. I don’t have access to internal systems or backend tools, and I appreciate your understanding of these limits.

I hope the information shared helps point you in the right direction. Please try the steps above and let me know if they work. If not, we can continue working together to narrow this down.

The first response may not always resolve the issue right away, but with your help and more details, we can work toward a solution.

Thank you for your patience and understanding. I'm looking forward for your reply.

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Dear @HS,Thank you for sharing your feedback about your recent interactions with our team. I'm glad that your issue has been solved.

Therefore, I would make a brief summary of this post so that other forum members could easily find useful information here:  

Issue Description:

After clicking Quit and Update in Microsoft Teams on macOS Ventura (M2), the app began crashing and could not open. The error showed a code-signing crash (EXC_CRASH – Code Signature Invalid). The user was signed into two accounts (work and university). Reinstalling Teams, clearing files, granting permissions, running Disk Utility, and restarting did not resolve the issue. Teams continued to work on web and mobile.

Current Solution (updated by @HS)

Step 1: Reset the routined service using Terminal commands sourced online (validated by reviewing crash logs and testing afterward).

Step 2: Confirmed that resetting routined stopped repeated background crashes.

Step 3: Performed a full removal of Microsoft Teams following thorough uninstall steps. For reference: https://learn.microsoft.com/en-us/answers/questions/4401362/how-to-completely-remove-teams-from-mac?forum=msteams-all&referrer=answers&page=3#answers

Step 4: Installed the latest macOS software update.

Step 5: Re-downloaded and reinstalled Microsoft Teams from the Microsoft website.

Note: In the meantime, If you see my replies bring helpful information, please kindly accept it as an answer and vote it up by your original account, which raised this question. Once marked, it will automatically pin to top. As other users will also search information in this community, your valuable vote up will definitely also help other users who have similar queries easily to find the correct channel and useful information more quickly.

Thank you for your patience and understanding. I'm looking forward for your reply.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".   

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