My teams invite is not reaching recipients

Hi @Chander Mannar, 

Thank you for posting your question in the Microsoft Q&A forum. To better understand what might be happening and help narrow down the root cause, I’d like to clarify a few details with you:  

• Could you let me know whether you’re sending the Teams meeting invitation directly from the Teams app or from Outlook? If possible, please also try sending the meeting invite from Outlook on the web or Teams web version to see if the recipients receive it there. This helps determine whether the issue is related to the desktop client or something else.  
• When you send the invitation, do you see any error messages, or does the meeting appear in your Sent Items normally while recipients report that nothing arrived on their side? 
• Are all recipients not receiving the invite, or only certain people or domains? 
• Are you able to send regular emails to these same recipients without any issues? 
• I also noticed that your question was posted with the Microsoft Teams for Business channel tag. May I kindly reconfirm whether you’re using a Microsoft 365 Business (work or school) account, or a Personal Microsoft account? Additionally, are you an end user, or do you have admin permissions within your organization? 

Please understand that our initial response may not fully resolve the issue or meet your expectations immediately. However, with your help, patience, and more detailed information, we can work together to find the most suitable solution or direction forward.  

Whenever you’re ready, feel free to reply with the details above by leaving a comment under this post.  

Thank you again for your understanding, and I look forward to hearing from you!

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.  

Use the following checks and fixes to resolve Teams meeting or webinar invitations not reaching recipients:

1. Ask recipients to check Junk/Spam folders
   • Recipients should look for the Teams invite in their Junk or Spam folder.
   • If found, they should mark it as “Not junk” and add the sender to their Safe Senders list to prevent future issues.
2. Check if the sender is being blocked as spam
   • If the sender’s address is being flagged, recipients should add it to their Safe Senders list as described in the guidance for sharing-related notifications.
3. If this is a Teams webinar invite
   • Teams webinar invitations are sent using the Microsoft Dynamics 365 email delivery service.
   • If the organization has strict security policies for external email, these messages may be quarantined by spam filters.
   • An admin should:
     1. Add the IP addresses used by the Dynamics email delivery service to the allow list of the organization’s spam filter.
     2. If using Microsoft 365 Defender:
        • Go to Microsoft 365 Defender portal → Anti-spam policies.
        • Select Connection filter policy (Default) (do not tick the checkbox).
        • In the flyout, under Connection filtering, select Edit connection filter policy.
        • Under Always allow messages from the following IP addresses or address range, add the Dynamics email service IPs, confirm the entry, and select Save.
        • If prompted to enable customization, select Yes and wait for it to complete.
        • If customization is disabled and errors appear, wait a few hours and retry. If still blocked, an admin must:
          • Connect to Exchange Online PowerShell.
          • Run Enable-OrganizationCustomization and then re-add the IP ranges.
4. Confirm recipients’ email configuration in Microsoft 365/Entra (internal recipients)
   • If internal users do not receive any system-generated notifications (sharing, tasks, etc.), an admin should verify their account configuration:
     • In Microsoft Entra admin center:
       • Go to Identity → Users → All users, select the affected user.
       • Ensure User type is Member (not Guest). If needed, edit properties and change to Member.
       • Under Contact Information, ensure the Email property is correctly populated and save.
     • Or in Microsoft 365 admin center:
       • Go to Users → Active users, select the affected user.
       • Under Account → Username and email → Manage username and email, verify and correct the primary email address and domain, then save changes.
5. If the issue persists
   • If none of the above resolves the problem, the organization’s IT/admin should review spam/quarantine logs and mail flow rules for blocked meeting invitations, and then adjust policies accordingly.

References:

• Issues that affect Teams webinars
• Email notifications from sharing events aren't delivered to recipients
• Conferencing Invite Failed