Teams meeting invites disappear from inbox

Question

All teams meeting invites sent to our users are being added to the calendar as tentative and removed from the inbox. The invites do not go to the deleted items and appear to be removed from the mailbox entirely. This is occurring in both Outlook and OWA. Both clients have had automatic processing disabled. The exchange server has been checked for mail flow rules and hidden rules. User rules have also been check to ensure they are not causing the issue. All invites from other sources behave as expected, being added as tentative to the calendar but remaining in the inbox until the user addresses the invite manually. We do not have Teams and these invites all originate from third parties. Any thoughts on why this is occurring?

Answer 1

Hi @Archer x64

How did the meeting organizer schedule Teams meeting? Outlook or Teams client?

Does anyone else have the same issue in your organization?

Please make sure you have enabled for Exchange Online, SharePoint Online, and Microsoft 365 Group creation. If mailboxes are hosted on-premises, to create and view meetings, the following requirements must be met:
*The required Teams license needs to be assigned for the Azure Active Directory synced user.
*Users must be synchronized to Azure Active Directory.
*Mailboxes are hosted in Exchange Server 2016 Cumulative Update 3 or later.
*Autodiscover and Exchange Web Services is published externally.
*OAuth authentication is configured preferably via the Exchange Hybrid Configuration Wizard running a full hybrid configuration (Classic or Modern)

For more reference, you can learn it from:

https://learn.microsoft.com/en-us/microsoftteams/exchange-teams-interact#requirements-to-create-and-view-meetings-for-mailboxes-hosted-on-premises

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