My client's MS Teams meeting button in Outlook calendar page suddenly missing

Question

My client's MS Teams meeting button in Outlook calendar page suddenly missing

Werner Yue 0

Hi All,

Not sure if I have posted in correct location, but looking for feedback if anyone also experiencing the same issue.

2 weeks ago, 1 of the staffs in our client site, her Desktop Outlook App starting having problem, the MS Teams button in calendar page is gone. We found that the MS Teams meeting COM Add-in is not showing.

I have tried all possible ways to fix which I can find online, even though we have used another laptop and inform the user to login her AAD profile, it also not working.

clean uninstall MS Teams and Office suite, reinstall all Apps
clear the register key for the user owned "MS Teams meeting for Outlook Add-in"

We suspect it is the account permission issue on M365, which we have no admin role as we are just region IT support not the HQ IT team.

With the checking with HQ IT, we found out that the MS teams meeting button is working on New Outlook App, it just disappeared in Classic Outlook App.

Somehow on last Friday, the staff told me that, the other staff she working closely also having the same problem, the button suddenly disappeared in her Classic Outlook App.

With that I am thinking will it be related to any latest MS Teams or Outlook App update, or something wrong on M365 side. For users they prefer to use Classic Outlook App as the interface on New Outlook App is not looks good for tgem.

Looking forward if anyone get the same issue, thanks for concern, and sorry again if I have posted in wrong place.

Best regards,

Werner

Joan Hua-MSFT 5,300 Reputation points Microsoft External Staff

2025-03-31T05:08:36.58+00:00

Hi @Werner Yue

If an answer has been helpful, please consider accepting the answer. This will make answer searching in the forum easier and be beneficial to other community members as well.

Thank you for helping to improve Microsoft Q&A!

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Joan Hua-MSFT 5,300 Reputation points Microsoft External Staff

2025-03-31T05:08:36.58+00:00

Hi @Werner Yue

If an answer has been helpful, please consider accepting the answer. This will make answer searching in the forum easier and be beneficial to other community members as well.

Thank you for helping to improve Microsoft Q&A!

Answer 1

Joan Hua-MSFT 5,300 Microsoft External Staff

Hi @Werner Yue

Welcome to our forum!

Please check the status of your add-in is enabled first, you may take the following steps: User's image

Meanwhile, you may run the classic Teams add-in for classic Outlook troubleshooter to get more solutions. More information: Resolve issues with Teams Meeting add-in for classic Outlook - Microsoft Teams | Microsoft Learn

(Note: Part of the article mentions modifying the registry, please be cautious about doing so. Serious problems can occur if you modify the registry incorrectly. Before making changes, back up the registry to restore it in case something goes wrong.)

In addition, as a workaround, it is suggested please reset the Teams install under Settings. This is as the Teams add-in may be not shown as installed under Settings> Apps. The reset triggers the add-in to be reinstalled.

Hope it helps!

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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Werner Yue 0 Reputation points

2025-03-24T07:40:05.8633333+00:00

Good day Joan,

Thank you for the reply with details. Sadly for the Add-in, we already checked few times, before and after uninstall MS Teams and reinstall. It just not showing the add-in in Classic Outlook App. I also followed some posts that to re-register the Add-in loader, but it is not working as well.

For the troubleshooter tool, I tried it as well, it just stuck and keep spinning (waited 2+ hours, then I gave up).

Apart from uninstall and reinstall, we also tried to use the Reset option in Settings -> Apps, it is also not able to fix the issue.

These are the links I found and followed.
https://learn.microsoft.com/en-us/microsoftteams/troubleshoot/meetings/resolve-teams-meeting-add-in-issues#verify-registry-settings

https://answers.microsoft.com/en-us/outlook_com/forum/all/microsoft-teams-meetign-addin-for-outlook-cant/1d5b09cc-8eef-49d5-acf1-64dc4bf17376?page=3

I asked HQ if something they have applied via M365 portal. Meanwhile I tried to research online but seems no people talking about the weird things, so I still not sure if it is system issue, or it is the user laptop problem (but in spare laptop it is also not working). Looking forward for more suggestions and test cases, thanks!

Best regards,

Werner
Joan Hua-MSFT 5,300 Reputation points Microsoft External Staff

2025-03-26T05:54:28.0566667+00:00

Hi @Werner Yue

Thanks for response.

Please refer to the solution Michal_Ky provided and try again. In addition, if the add-in is still missing, you may need to check if the value in registry is missing. More information: Teams meeting add-in missing from Outlook and new Teams - Microsoft Teams | Microsoft Learn.

Hope it helps.
Werner Yue 0 Reputation points

2025-03-26T06:13:49.57+00:00

Hi Joan,

Thank you for the kindly follow up. For the suggestion mentioned by Michal_Ky, I also followed but same thing.

For the PS script, it is something I am afraid to run as it may hit the HQ anti-virus and security sensor, I will bring it up to them see if they can help.

Thanks for your advise again, I hope that solution can help on this situation. By the way, those methods seems can only fix on the machine, but we faced the same issue when we logged in the same user account on other company laptop.
Joan Hua-MSFT 5,300 Reputation points Microsoft External Staff

2025-03-28T05:31:40.5233333+00:00

Hi @Werner Yue

Thanks for your patience.

Since you mentioned that there are still problems with the same account on different devices, you may need to contact the administrator to find out if there is a change in the account allocation policy, and if not, but the problem persists, please consider reassigning.

In addition, please ensure the administrator have turned on Allow the Outlook Add-in and Allow scheduling for private meetings. More information: Admin - authentication requirements and functionality of the Teams Meeting add-in in Outlook - Microsoft Teams | Microsoft Learn Hope it helps.

(By the way: If the answer is helpful, then would you please "Accept the answer" as it would be helpful to others in the community as well. Warm thanks！ )

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My client's MS Teams meeting button in Outlook calendar page suddenly missing

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