I can't create Teams Meetings through my Outlook calendar

Hi @Vincent Côté, 

I hope you are having a wonderful day. 

Based on the information you shared that you cannot create Teams meetings from the Classic Outlook calendar because the New Teams Meeting option is greyed out on this specific PC, even though the Teams meeting add in is enabled and Microsoft 365 and Teams have already been reinstalled. 

This behavior usually occurs when Outlook is unable to load the Teams Meeting add in properly during startup, or when Outlook has placed the add in into a disabled state due to stability or performance detection, which can happen on one device even when other computers work normally. In addition, the Teams meeting experience differs by Outlook version, since new Outlook uses a built in Teams meeting toggle rather than the classic COM add in model.  

Below are some workarounds that will suit your situation, listed from the fastest to the most comprehensive: 

1/ Confirm the Teams add-in is allowed to load in Outlook 

• Close Outlook completely (make sure it is not running in Task Manager). 
• Open Outlook (Classic) > File > Options > Add-ins. 
• At the bottom, next to Manage, select COM Add-ins > Go. 
• Ensure Microsoft Teams Meeting Add-in for Microsoft Office is checked. 
• Select OK, then restart Outlook and check the Calendar ribbon again. 
• If it appears under Disabled Application Add-ins, open Manage: Disabled Items and re-enable it, then restart Outlook. 
• Reference: Can't create a Teams Meeting in Outlook because the Teams Meeting add-in has become disabled - Microsoft Support 

2/ Re-register the Teams Meeting add-in (most effective when only one PC is impacted) 

• Close both Outlook and Teams fully before proceeding. 
• Press Windows + R, type regedit, and press Enter to open the Registry Editor. 
• Navigate to: HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Addins\TeamsAddin.FastConnect 
• Locate the value named LoadBehavior. It must be set to 3. If it shows any other value (such as 0, 2, or 8), double-click it and change the value to 3. 
• Next, navigate to: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Resiliency\DisabledItems 
• Delete any entries related to Teams found in this folder, as Outlook may have permanently disabled the add-in here without notifying you. 
• Finally, go to: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Resiliency\DoNotDisableAddinList 
• If TeamsAddin.FastConnect is not listed, right-click the folder, select New > DWORD (32-bit) Value, name it TeamsAddin.FastConnect, and set its value to 1. This prevents Outlook from disabling the add-in again in the future. 
• Restart your computer, then open Outlook and check whether the Teams Meeting button is now available.  
• Reference: Understanding the Microsoft Teams Meeting Add-in for Outlook: Eligibility, Issues, and Troubleshooting - Microsoft Support 

3/ Run the Microsoft Support and Recovery Assistant (SaRA) 

• If the steps above do not fully resolve the behavior, please download the Microsoft Support and Recovery Assistant directly from: aka.ms/SaRA-OutlookTeamsAddin 
• Once installed, select Outlook from the product list, then choose the option: "Teams Meeting add-in for Outlook is missing or the button is grayed out." 
• The tool will automatically scan your environment, detect the root cause specific to your machine configuration, and apply the appropriate repair without requiring any manual steps. 
• Reference: Troubleshoot the Teams Meeting add-in in Outlook for Windows - Microsoft Support 

4/ Rebuild the Outlook profile (fixes greyed-out meeting providers and ribbon states) 

• Close Outlook. 
• Open Control Panel > Mail > Show Profiles. 
• Select Add…, create a new profile (example: “Outlook-Test”), and add the same Microsoft 365 account. 
• Choose Always use this profile and select the new profile. 
• Open Outlook and test creating a Teams Meeting from the Calendar. 
• If it works in the new profile, the previous profile was holding the disabled add-in state; the new profile can remain as the primary one. 

5/ Contact IT administrator:      

Since your account is managed by your organization, please contact your IT administrator to review your permissions and policies. If the issue persists after these checks, ask your IT administrator to submit a support request directly to Microsoft Support team.          

They can raise a support ticket by visiting: Get support - Microsoft 365 admin | Microsoft Learn    

As community moderators, we appreciate your understanding that our access to internal development details is limited. Our primary role is to guide users toward the appropriate resources and support channels. While we may not have visibility into deeper backend analysis, we’ll continue doing our best to support you within the scope of our responsibilities.         

I hope this information is helpful. Please follow these steps and let me know if it works for you. If you have any updates regarding the issue, please feel free to share them with me.           

Thank you for your patience and your understanding. I look forward to continuing the conversation. 

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Since the issue is limited to one user and the Teams add-in is already enabled and reinstallation did not help, the most relevant next step is to repair the user’s mailbox calendar configuration so Outlook knows to use Teams as the online meeting provider.

Have an Exchange Online admin run the following PowerShell cmdlet for the affected mailbox:

Set-MailboxCalendarConfiguration -Identity <user@domain> -DefaultOnlineMeetingProvider TeamsForBusiness

Replace <user@domain> with the affected user’s mailbox address.

This fixes cases where the DefaultOnlineMeetingProvider value is corrupted or set to Unknown, which prevents the Teams toggle or button from being available even though the add-in is installed and working. After running the cmdlet, have the user restart Outlook and test creating a new meeting from the calendar again.

If the problem persists after that, verify on the same mailbox that working hours and other calendar settings are valid (no invalid ranges such as 09:00–00:01), then re-run the cmdlet and restart Outlook once more.

References:

• Teams Meeting toggle on new Outlook and Teams upon creating event not available - Microsoft Q&A