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.
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:
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.
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.
