Teams add-in is missing for outlook classic

Question

I uninstalled both Office 365 and the Teams app from my system and reinstalled them using the Click-to-Run executable. However, the issue persists.

I exited the Outlook application, signed out of the Teams app, signed back in, and then reopened Outlook. Despite this, the Teams add-in is still not visible in Outlook, and it also does not appear in the list of installed apps list.

 

Please let me know the next steps to resolve this issue.

Answer 1

Hi @Rambhawan Pal,

Thank you for posting your question in the Microsoft Q&A forum and for taking the time to clearly describe the steps you’ve already tried.

I understand how inconvenient it can be when the Teams Meeting option disappears from Classic Outlook, especially after you’ve already gone through multiple reinstall attempts. Even after reinstalling both Microsoft Teams and Office, the Teams meeting integration may still remain missing in some cases. This can happen, for example, if the COM add‑in was disabled by Outlook, the ribbon command is hidden, or the add‑in did not re‑register correctly after the reinstall process.

With that in mind, I recommend going through the steps below in the exact order listed, as each step addresses a different and common root cause of this issue.

1/ Uncheck and recheck the Teams COM Add‑in:

First, in Outlook, please go to File > Options > Add‑ins. Under Manage: COM Add‑ins, click Go, then uncheck Microsoft Teams Meeting Add‑in for Microsoft Office. Click OK, restart Outlook, and then return to the same location to check the add‑in again.

Outlook may disable or stop loading COM add‑ins for reliability or performance reasons, so toggling the add‑in off and back on helps force Outlook to load it again.

2/ Uninstall and then reinstall Teams:

Next, even though you’ve already tried reinstalling Teams, please perform a clean uninstall once more. This includes removing Microsoft Teams as well as Teams Machine‑Wide Installer, if it is present. After that, reinstall Teams and restart Outlook.

Additionally, Microsoft notes that after updating to the new Teams, the meeting add‑in may be missing until Teams re‑installs it properly. Their recommended workaround is to remove the Teams Meeting Add‑in entry (if it exists), fully close both Teams and Outlook, and then restart the new Teams so it can re‑add the add‑in automatically.

You can find Microsoft’s reference here: Teams Meeting add-in is missing in Outlook Desktop after updating to New Teams.

3/ Uninstall and then reinstall Office:

If the issue persists after steps 1 and 2, please proceed to completely uninstall Microsoft 365 / Office, then reinstall it.

This step helps rule out a damaged Office or Outlook installation, as well as mismatched components that may prevent COM add‑ins from registering or loading correctly.

4/ Check ribbon settings:

After that, if the add‑in exists but the Teams Meeting button is still not visible, please verify that the Outlook ribbon has not been customized in a way that hides it. Also, ensure the ribbon is fully shown and not collapsed or hidden.

5/ Run Microsoft SaRA / Get Help troubleshooter:

Microsoft also provides an automated troubleshooter specifically designed for issues with the Teams Meeting add‑in in classic Outlook. This tool checks for common problems such as missing registrations or disabled add‑in states and applies the appropriate fixes automatically.

If you are not an administrator, you can follow the guidance provided in this article: Resolve issues that affect the Teams Meeting add-in for classic Outlook.

6/ Involve your IT administrator:

Finally, if tenant‑level policies are blocking or limiting the add‑in, local reinstalls may not resolve the issue consistently. In this case, your IT administrator can run Microsoft’s dedicated diagnostics and confirm that the correct policies and settings are applied.

Your admin can refer to the instructions here: Resolve issues that affect the Teams Meeting add-in for classic Outlook.

If you have completed all the steps above and the issue still persists, you may consider creating a support ticket by sign in to the Microsoft 365 Admin Center following steps from this link: Get support - Microsoft 365 admin | Microsoft Learn to raise a support ticket from admin center or calling the phone support to contact Microsoft Support: Customer service phone numbers - Microsoft Support for deeper investigation. If you don't have admin privileges, you can ask your IT administrator to create it on your behalf.

Alternatively, you can look for the way to find your admin through this link: How do I find my Microsoft 365 admin? - Microsoft Support.

Note: We appreciate your understanding regarding the scope of support available through this forum. As moderators, our role is to provide general guidance and assist with common troubleshooting steps. While we do not have access to internal systems or administrative tools required to resolve account-specific or backend-related issues but we’ll continue doing our best to support you within the scope of our responsibilities.  

I hope the information provided proves useful. Please proceed with the outlined steps and let me know whether they resolve the issue. If not, I’ll be glad to continue working with you to find a solution.

Thank you for your patience and understanding throughout this process. Should you have any questions or need further assistance, feel free to reach out at any time.

I look forward to hearing from you.

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Answer 2

To resolve the issue of the Teams add-in being missing from Outlook after reinstalling both Office 365 and the Teams app, you can follow these steps:

1. Verify Installation: Ensure that the Teams desktop client is installed, as the Teams Meeting add-in cannot be installed if only the Teams web client is used.
2. Check Outlook Version: Make sure you are using Outlook 2016 or a later version. Also, ensure that all available updates for the Outlook desktop client are applied.
3. Exit Applications: Exit both Outlook and Teams completely.
4. Reregister the Add-in: You may need to re-register the Microsoft Teams add-in. To do this:
   • Open File Explorer and navigate to the %LocalAppData%\Microsoft\TeamsMeetingAddin folder.
   • Select the subfolder that matches the version number of Teams you have installed.
   • Copy the path of this subfolder.
   • Open an elevated Command Prompt window and run the appropriate command:
     • For 64-bit Office:

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

     • For 32-bit Office:

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

5. Restart Applications: After re-registering, restart the Teams desktop client, sign out and back in, and then restart Outlook. Ensure that Outlook is not running in Administrator mode.
6. Check Add-in Status: In Outlook, go to File > Options > Add-ins and check if the Microsoft Teams Meeting Add-in for Microsoft Office is listed under Active Application Add-ins. If it’s not there, check the Disabled Application Add-ins list and enable it if necessary.

If the add-in still does not appear after these steps, you may need to use the Microsoft Support and Recovery Assistant to troubleshoot further or check the registry settings as described in the troubleshooting guide.

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References:

• Teams Meeting add-in is missing or its installation fails
• Teams meeting add-in missing from Outlook and new Teams