Missing entries Outlook Client and OWA

Ramesh Raja 5 Reputation points
2023-06-05T14:23:27.15+00:00

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.

Microsoft 365
Microsoft 365
Formerly Office 365, is a line of subscription services offered by Microsoft which adds to and includes the Microsoft Office product line.
5,314 questions
Outlook
Outlook
A family of Microsoft email and calendar products.
4,181 questions
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  1. Yuki Sun-MSFT 41,171 Reputation points Microsoft Vendor
    2023-06-06T03:25:12.2633333+00:00

    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
    
    

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