Missing entries Outlook Client and OWA

Question

Hello,

we have since a few months problem with automatically cancelled meetings, specially for mailboxes which have been assigned delegate permissions ( to send and act on behalf of the person).

We found out that some of the send messages (invitation and the cancelled notification messages) are missing in OWA (outlook.com) but can be found on the outlook client.

Wondering if anybody has a clue? The users still use Office 2019. But additionally they have a M365 E5 License.

Answer 1

Hi @Ramesh Raja ,

we have since a few months problem with automatically cancelled meetings, specially for mailboxes which have been assigned delegate permissions ( to send and act on behalf of the person).

Supposing Audit log is enabled in your organization, you can start troubleshooting by checking the audit logs to find out the problematic meetings were canceled or deleted from whose side.

You can search the audit log in the compliance portal by following Search the audit log in the compliance portal.

Or you can use the Search-MailboxAuditLog cmdlet like below:

Search-MailboxAuditLog <MailboxIdentity> -ShowDetails -StartDate 6/1/2023 -EndDate 6/6/2023 | Where-Object {($_.Operation -like "*Delete") -and ($_.FolderPathName -like "*Calendar")} |Select-Object LogonUserDisplayName, Operation, FolderPathName, SourceItemSubjectsList, LastAccessed

---

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have 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.