Microsoft Teams add-in is not working for some of our VDI users.

Jose Rodriguez 25 Reputation points
2026-08-11T15:16:02.4666667+00:00

We've verified that the Teams in outlook add-in is enabled and not deactivated by outlook.

we've also ensured that teams is updated in the parent and all machines in the pool. however the functionality does not appear under some of our users.

is there anything you can suggest that might help?

Microsoft Teams | Microsoft Teams for business | Calendar | Other

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  1. AI answer

    2026-08-11T15:16:23.77+00:00

    For VDI users, one likely cause is the classic-to-new Teams transition. When users are assigned the "new Teams only" upgrade policy, the new Teams app can remove classic Teams after a period of time, and then the Teams Meeting add-in may stop loading and be removed from Outlook.

    Checks and actions that are supported by the documented guidance:

    1. Confirm the add-in is active in classic Outlook
      • In Outlook, go to File > Options > Add-ins.
      • Verify Microsoft Teams Meeting Add-in for Microsoft Office appears in Active Application Add-ins.
      • If it appears under Disabled Application Add-ins, select Manage > COM Add-ins > Go, enable it, select OK, and restart Outlook.
    2. Verify Teams desktop client is installed for affected users
      • The meeting add-in cannot be installed if the user only uses the Teams web client.
      • Also verify affected users are on Outlook 2016 or later and that Outlook desktop updates are applied.
    3. Restart in the correct order
      • Close both apps.
      • Start Teams first, sign in, then start Outlook.
    4. Check for common conditions that make the add-in disappear
      • Make sure users are signed in to the Teams desktop app with a valid commercial account.
      • Confirm Outlook and Teams are running in the same context and that Outlook is not running as administrator while Teams is not.
      • If Office was installed from the Microsoft Store, the Teams Meeting add-in is not supported. A Click-to-Run Office installation is required.
    5. If the issue started after moving users to new Teams
      • Check whether affected users were assigned the "new Teams only" policy.
      • The documented symptom is that after the upgrade, the add-in can be removed from Outlook.
      • For non-VDI environments, Microsoft documents reinstall steps for the Teams Meeting add-in after this transition. Since the reported issue is specifically in VDI, this points to the upgrade/policy state as an important differentiator to compare between affected and unaffected users.
    6. Advanced remediation
      • If the add-in still does not appear, Microsoft documents reregistering Microsoft.Teams.AddinLoader.dll from the %LocalAppData%\Microsoft\TeamsMeetingAddin folder after exiting Outlook and Teams.
    7. If Outlook is disabling the add-in for performance
      • In Outlook Desktop, go to File > Manage COM Add-ins.
      • For Microsoft Teams Meeting Add-in for Microsoft Office, select Do not monitor this add-in for the next 30 days or Always enable this add-in.
      • If needed, re-enable it from File > Options > Add-ins > Manage: Disabled items > Go.
      • Risk: editing the registry is advanced and can affect Outlook behavior if done incorrectly. If using the documented prevention step, add TeamsAddin.FastConnect=1 under HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Resiliency\DoNotDisableAddinList only if standard re-enable steps do not hold.
    8. Verify prerequisites on affected VDI images/users
      • Confirm .NET 4.8 and WebView2 are present, because they are required for the Teams Meeting Add-in in Outlook.

    A practical way to narrow this down is to compare one affected VDI user and one working VDI user for these exact items: Teams upgrade policy, Office install type, Teams desktop client presence, Outlook elevation state, and whether the add-in files exist under %LocalAppData%\Microsoft\TeamsMeetingAddin.

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

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  2. Ryan-N 15,555 Reputation points Microsoft External Staff Moderator
    2026-08-11T15:38:16.13+00:00

    Hi Jose,

    Welcome to the Microsoft Q&A forum.

    Based on your description, the Teams Meeting Add-in in Classic Outlook is not working even though the add-in is enabled.

    Please follow the steps below and let me know whether the issue is resolved:

    1/ Restart Teams and Outlook

    1. Completely close both Teams and Outlook.
    2. Then reopen both applications.

    1/ Re-register the Teams Add-in Loader

    1. Verify that the user has the Teams desktop application installed on the computer. The meeting add-in cannot be installed if Teams is only used through a web browser.
    2. Exit Outlook.
    3. Exit Teams.
    4. Re-register the Microsoft.Teams.AddinLoader.dll file:

    a. Open File Explorer and browse to:

    %LocalAppData%\Microsoft\TeamsMeetingAddin

    b. Open the subfolder that matches the version number. If multiple version folders exist, select the folder with the highest build number and copy its path. For example:

    %LocalAppData%\Microsoft\TeamsMeetingAddin\1.0.23334.11

    c. Open Command Prompt as Administrator and run the command that matches your Office version:

    For 64-bit Office:

    %SystemRoot%\System32\regsvr32.exe /n /i:user <copied_path>\x64\Microsoft.Teams.AddinLoader.dll

    For 32-bit Office:        

    %SystemRoot%\SysWOW64\regsvr32.exe /n /i:user <copied_path>\x86\Microsoft.Teams.AddinLoader.dll

    1. Restart the Teams desktop application.
    2. Sign out of Teams, then sign back in.
    3. Restart Outlook. Make sure Outlook is not running as Administrator.

    You can also refer to the following documentation for additional guidance:

     Fix Teams Meeting add-in problems in Classic Outlook - Microsoft Teams | Microsoft Learn

    I hope this information is helpful. Please follow these steps and let me know if it works for you. If not, we can work together to resolve this.   

    Thank you for your patience and your understanding. If you have any questions or need further assistance, please feel free to share them in the comments on this post so I can continue to support you.

    I look forward to continuing the conversation.

    If the answer is helpful, please click "Yes". 

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