How to Fix Missing Microsoft Teams Add-in for Outlook on Windows 10?

The Microsoft Teams add-in for Outlook may disappear, leaving users unable to schedule Teams meetings directly from Outlook. When the Microsoft Teams add-in for Outlook goes missing, users often notice that they cannot schedule or manage Teams meetings directly from their Outlook calendar.

This issue typically occurs when the add-in becomes disabled or unregistered, often following an update or a failed installation. The primary cause is usually a registry key or DLL file that is missing or corrupted, preventing Outlook from loading the add-in properly. Additional contributing factors include conflicts between different versions of Office or Teams, incorrect installation paths, or the use of different architectures (32-bit vs 64-bit).

Requirements:

We recommend you go through these small but promising workarounds to rectify your problem as sometimes, we miss common things that shouldn’t be ignored in the first place.

1. Software Criteria: Before you attempt to download the Microsoft Teams add-in for Outlook, be aware that only recent versions of Office 365 and Exchange allow the installation or use of add-ins. To use this add-in, you will need to be running one of the following versions at a minimum: Office 2013, Office 2016, Exchange 2013, and Exchange 2016.
   Once you have the correct version of Outlook and Microsoft Teams on a computer, the add-in should appear in the Outlook menus and options automatically. If it does not appear in Outlook, let’s see what its solutions are.
2. Install MS Teams App with Admin Privileges: One requirement for successfully installing the add-in on a Windows computer is that the user must have administrator permissions on the computer. This is necessary because COM add-ins to Outlook write to the Windows registry, and only administrators can modify the registry. If the user who wants to schedule Teams meetings in Outlook is not an administrator, an administrator must install the Teams app first, and then the user can sign in and run Outlook.
3. Run Outlook in Normal Mode: When starting Outlook, do not run it with elevated permissions as this can interfere with identifying registered COM add-ins.

Solution 1: Register Microsoft Teams DLL Files

A dynamic link library (DLL) contains program code that a number of applications may need to access in order to run. For programs to find the DLLs that they require, the DLLs must be registered. regsvr32 is a command-line tool in Windows that stands for Microsoft Register Server. It’s used to register and unregister Object Linking and Embedding (OLE) controls. When regsvr32 registers a DLL file, information about its associated program files is added to the Windows Registry. It’s those references that other programs can access the registry to understand where the program data is and how to interact with it.

When we compile an application and put its dependent compiled DLLs in the same folder as the exe file, the application should run without any problem. But sometimes we still need to register those dependent DLLs using the regsvr32 command because the only exception to this is COM and ActiveX DLLs which need to add certain keys to the registry. This proved to be a helpful solution for many users online as per the data collected by our Research Team. For a normal DLL (including .NET class libraries), you only need to know its path. To register Microsoft Teams DLL files, follow the steps below:

1. Click Start, search This PC, and open it.

   

2. Open C drive and then find Microsoft.Teams.AddinLoader.dll in your user account. The path may vary due to the different versions e.g., 1.0.20244.4 in our case. Copy this file path.

   C:\Users\\AppData\Local\Microsoft\Teams\TeamsMeetingAddin\1.0.20244.4\x86

   

3. Click Start, search Command Prompt and click on Run as an Administrator option. This will open the Command Prompt window that is an automation tool of the Windows operating system.

   

4. Paste the file destination (that you earlier copied) in the command prompt and press Enter. First, it will verify the file path and then will ask for the file to register.
5. Now, copy-paste the following command in the command prompt and press Enter.

   regsvr32 Microsoft.Teams.AddinLoader.dll

   

6. A popup box will appear saying “DllRegisterServer in Microsoft.Teams.AddinLoader.dll succeeded”. Click OK and close the Command Prompt.

   

7. Click Start, Power Icon select Restart. This will restart your PC and save all the changes made to the system.

   

8. Once Windows is successfully loaded, try running Microsoft Outlook. MS Teams Add-in should now be visible and working fine. In case it does not work, it means that either the Add-ins toolbar is disabled or Outlook is blocked in Meeting policies.

Solution 2: Ensure Add-In is Enabled and Installed

Add-ins in Microsoft Outlook are small programs or utilities that help you automate tasks when you view or create messages. Microsoft has partnered with leading companies to build add-ins that help you get things done right from your inbox. The Microsoft Teams add-in for Outlook is a really useful integration tool for users of both programs. Its primary purpose is to allow users to schedule a Teams Meeting directly from Outlook without having to open both programs at the same time.

Outlook sometimes disables add-ins if it believes that an add-in is interfering with Outlook’s functionality or is a threat to privacy and security. In some cases, it is not the fault of the disabled add-in. Outlook can be overly aggressive here. If you rely on some add-ins, it is important for you to ensure that they stay enabled. This was the case for many users online and they were able to rectify the problem by following this procedure. Follow these instructions to check whether the Microsoft Teams add-in is installed and enabled.

1. Click Start, search Outlook, and open the specified program.
2. Click File and then Options. This will open a window that contains all options and settings that the user can change in Microsoft Outlook i.e., General, Mail, Groups, People, etc.
3. Select the Add-ins tab from the left bar in the Options window. This will show all available settings related to Add-ins for Microsoft Outlook.

   

4. Confirm that Microsoft Teams Meeting Add-in for Microsoft Office is listed in the Active Application Add-ins list. If the mentioned Add-in is listed in the Disabled Application Add-ins list, select COM Add-ins in the Manage drop-down menu and click Go. This will open the COM Add-ins window where you can allow/disallow all the Add-ins that you want in the Microsoft Outlook Ribbon.

   

5. Enable Microsoft Teams Meeting Add-in for Microsoft Office in this list and click OK to save changes. This will enable the MS Teams Add-in for Outlook on the main Outlook window.

   

6. Now restart the Microsoft Outlook application. This will ensure that saved changes are being accepted by the program execution. The Microsoft Teams Add-in should be accessible under the Microsoft Outlook Ribbon now. In case it still does not work, then the only possibility left is; Microsoft Teams Meeting Policy has blocked the Outlook Add-in feature. Solution 3 will help you get through this problem.

Solution 3: Enable Outlook Add-Ins from Meeting Policies (Admin)

Meeting policies are used to control the features that are available to meeting participants for meetings scheduled by users in your organization. This is a per-user policy and applies before a meeting starts. Allow the Outlook Add-in setting to control whether Teams meetings can be scheduled from within Outlook (Windows, Mac, web, and mobile) or not. Also, users can access Teams Add-In from the Outlook home. If you turn this off, users are unable to schedule and access the Teams Add-In and meetings when they create a new meeting in Outlook. For example, in Outlook on Windows, the New Teams Meeting option won’t show up in the ribbon.

Basically, we need to enable the Outlook Add-in feature in the Microsoft Teams administrative settings so that it may work in Outlook.

1. Open Microsoft Teams Admin Center from your browser.
   Note: This page is only accessible by technical authorities, i.e., the IT Team. Therefore, make sure you have aligned any approvals from your organization before doing this.
2. In the left pane, select Meeting Policies under Meetings. This will take you to the terms and agreements of MS Teams policies.
3. Under the General section, enable the Allow the Outlook Add-in option. This will allow Microsoft Teams to use its Add-in integration in the Microsoft Outlook Software Interface.

   

4. Restart your Microsoft Outlook client and see if the MS Teams Add-in appears this time around. Your problem should finally be fixed now.