Are there any problems starting Microsoft Teams?

Emma 0 Reputation points
2026-11-06T14:57:17.09+00:00

Are there any problems starting Microsoft Teams? As if it is trying to start, but it does not start

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  1. Fahim-Nz 175 Reputation points Independent Advisor
    2026-11-06T15:07:42.8866667+00:00

    Hello @Emma ,

    Thank you for contacting the Microsoft Community.

    I understand that Microsoft Teams appears to be starting but does not fully open.

    To help us identify the cause and provide the appropriate troubleshooting steps, could you please clarify the following:

    1. Are you using the Microsoft Teams desktop application installed on your computer, or are you accessing Teams through a web browser such as Microsoft Edge or Google Chrome?
    2. If you are using the desktop application, does it remain stuck on the loading screen, or does it open briefly and then close?
    3. If you are using Teams on the web, does the same issue occur there?

    Once we have this information, we can guide you through the appropriate troubleshooting steps.

    I look forward to your response.

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  2. AI answer

    2026-11-06T14:57:56.4+00:00

    Yes. Microsoft documents several known causes when Teams appears to start but does not open, opens a blank window and closes, or fails when switching to new Teams.

    Common causes include:

    1. Network access issues
      • Teams can fail to launch if firewall or proxy settings block access to Teams endpoints.
    2. User profile or AppData folder issues
      • The new Teams app may not start if:
        • Cookies or Cache shell folders point to a reparse point.
        • TEMP or TMP point to a reparse point.
        • Required folders under AppData are missing permissions.
        • Some AppData folders are reparse points.
        • Invalid files exist with the same names as required system folders.
        • SYSTEM or Administrators lack Full control on required folders.
        • The Teams install location is missing SYSAPPID permission.
    3. Windows policy or OS version issues
      • The AllowAllTrustedApps policy can prevent new Teams from starting.
      • Unsupported or older Windows builds can also block launch.
    4. Third-party software conflicts
      • Dell Encryption is known to corrupt Teams during updates and can cause a permanent failure to start.

    Useful checks and fixes:

    1. If using new Teams, check whether the issue matches the known launch problem:
      • In classic Teams, if turning on Try the new Teams shows Something went wrong, this is a known scenario.
    2. Check network configuration
      • Verify that firewall or proxy settings are not blocking Teams endpoints.
    3. Check for Dell Encryption
      • If Dell Encryption is installed, exclude:
        • %LocalAppData%\Microsoft\Teams
      • This avoids corruption during Teams updates.
    4. Check Windows version and policy
      • Run winver.
      • If Windows is older than these builds, the AllowAllTrustedApps setting may need to be enabled:
        • Windows 11 21H2 build 22000.2777
        • Windows 11 22H2 build 22621.2506
        • Windows 10 21H2 build 19044.4046
        • Windows 10 22H2 build 19045.3636
      • If needed, check AllowAllTrustedApps in:
        • Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock
        • Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Appx
      • If the value is 0, change it to 1.
      • Warning: Registry changes can cause serious problems if done incorrectly. Back up the registry first.
    5. Check AppData-related conditions
      • Verify that Cookies, Cache, TEMP, and TMP do not point to reparse points.
      • Verify Read access to required AppData folders.
      • Verify required folders are not replaced by files of the same name.
      • Verify SYSTEM and Administrators have Full control where required.
    6. If the issue persists
      • If AppData folders were changed to reparse points, contact Microsoft Support.
      • If the system is on an older build, update to Windows 11 version 22H2 build 22621.2506 or later.
    AI-generated content may be incorrect. Read our transparency notes for more information.

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