TEAMS Invite Guest Confirmation(acceptance) Missing

Dear @PMcG, 

Thank you for posting your question in the Microsoft Q&A forum.   

I completely understand how inconvenient it can be when invitees are unable to accept a meeting and add it to their calendars. This issue often occurs when a meeting is created directly in the Teams app rather than through Outlook, as the invite may lack the proper calendar metadata (such as a structured .ics file). As a result: 

• Recipients only see the meeting link. 
• Their calendar does not recognize it as a schedulable event. 
• The “Accept” or “Decline” buttons are missing. 

Additionally, if the recipient’s Outlook profile is corrupted or the Microsoft Teams Meeting Add‑in for Classic Outlook is disabled, the invite may appear as a plain notification instead of a proper meeting request. 

Since you didn’t mention whether you and your invitees are using the New Outlook (web or desktop), Classic Outlook, or Teams on the web or desktop. Please see the following workarounds that will help you verify the issue:   

Option 1: Enable response options 

When creating a new meeting, after adding details and attendees, click More options > Response options > Request responses. 

Option 2: Schedule meetings through Outlook  

Please use Outlook to create Teams meetings. This ensures the invite includes a valid .ics file and triggers the acceptance flow for all recipients. 

New Outlook: 

 Classic Outlook:

Option 3: Verify the Teams Meeting Add‑in 

If invitees use Classic Outlook, ask them to check: 

Go to File > Options > Add‑ins. 

Under Manage: COM Add‑ins, click Go… 

Ensure Microsoft Teams Meeting Add‑in for Microsoft Office is checked. 

Invitees can join via https://teams.microsoft.com in a browser, which often bypasses client-side add‑in problems. 

Additionally, you can try using Teams on the web and send the meeting invite to see if the issue still persists. 

Option 4: Clear Teams cache 

This article provides further guidance on the topic: Clear the Teams client cache - Microsoft Teams | Microsoft Learn 

Option 5: Repair Teams app 

You can follow this article: Repair an Office application - Microsoft Support  

As community moderators, we kindly ask for 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 performing 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 not, we can work together to resolve this.    

Thank you for your patience and understanding. If you have any questions or need further assistance, please feel free to share them in the comments on this post so I can continue to support you. 

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

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.