Microsoft Teams App "Quit Unexpectedly" on MacOS 26.3

Orange Guy 0 Reputation points
2026-03-02T00:06:25.0766667+00:00

Hello,

I have not been able to start microsoft teams, and it always say teams quit unexpectedly. Here it the error code, which seems to say the library files are missing, but they are there. Even when deleting and reinstalling still here are issues... Thanks in advance to anyone who could help.

Microsoft Teams | Microsoft Teams for education | Settings | Other
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  1. Jade Ng 15,310 Reputation points Microsoft External Staff Moderator
    2026-03-02T01:28:02.65+00:00

    Dear @Orange Guy,

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

    First of all, I want to begin by sincerely apologizing for the frustration and inconvenience this issue has caused you.

    To help me investigate this issue further, could you please confirm the following:

    • Are you having issues with Teams web? You can try joining the meeting via the Teams web client at teams.microsoft.com and check if it occurs.
    • May I ask whether you have encountered this issue before?
    • Also, could you please confirm if any other users within your tenant are experiencing the same issue?

    In the meantime, please kindly try these troubleshooting steps below:

    1.Clear Teams cache: Cached data can sometimes cause problems. You can infer full instructions on macOS here: Clear the Teams client cache - Microsoft Teams | Microsoft Learn 

    2. Update the latest version:  

    • You open the Microsoft Teams app and click on your profile picture in the top-right corner.  
    • Then, you select "Check for updates" from the dropdown menu.  
    • If an update is available, choose "Update and restart Teams" to apply it.  

    For reference: Version update history for Teams app deployments - Office release notes | Microsoft Learn 

    3.Sign out and log back in: This will refresh your account linking and may resolve the issue. 

    If you try the steps above and still experience the crash, please let me know so I can guide you further. Thank you for your time and understanding.

    Looking forward to your response!

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

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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  2. AI answer

    2026-03-02T00:06:34.8533333+00:00

    The crash is occurring at launch because the Teams process fails a library load constraint for libSlimCoreWebview2.dylib and is terminated by the macOS dynamic loader (DYLD). This is a client launch failure of the Teams app.

    Based on the provided context, the supported remediation steps are:

    1. Verify OS compatibility
      • Ensure the Mac is running a supported macOS version for the new Teams client. If the OS is not supported, update macOS to a supported version and then reinstall Teams.
      • Unsupported OS versions are a known cause of Teams launch failures.
    2. Fully remove and reinstall the Teams client
      • Quit Teams if it is running.
      • Move the Microsoft Teams app from /Applications to the Trash.
      • Remove Teams-related data containers (similar to the pattern used for Office and Teams on macOS in the context):
        • ~/Library/Group Containers/UBF8T346G9.com.microsoft.teams
        • ~/Library/Containers/com.microsoft.teams2
      • Empty the Trash.
      • Download and reinstall the latest Microsoft Teams for macOS, then try launching again.
    3. Check for antivirus/DLP interference with WebView2
      • Teams relies on Edge WebView2 components; third‑party antivirus or DLP tools can block or tamper with these, causing client crashes or launch failures.
      • Ensure any non‑Microsoft antivirus/DLP products are configured to allow:
        • The Teams desktop client process.
        • The executable that starts Teams.
        • Microsoft Edge WebView2 processes and related libraries.
      • If such tools inject DLLs or otherwise constrain library loading, adjust their configuration per vendor guidance so they do not interfere with Teams/WebView2.
    4. If the issue persists
      • After confirming OS support, performing a full removal/reinstall, and ensuring security tools are not blocking Teams/WebView2, collect the crash details and contact Microsoft Support for deeper analysis of the code-signing/library-load constraint failure.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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