Hi,
Please use the following command to check the Mailbox Audit Logging action setting.
Get-Mailbox Identity username | fl name,*audit*
Are there any administrator, delegate, and owner actions in the audit logging configuration for that mailbox? Please post them to check this issue.
If the settings above are configured correctly, only the administrator, delegate, and owner actions specified in the audit logging configuration for the mailbox are logged. And the Audits folder will show up after the administrator, delegate,
and owner take the actions specified in the audit logging configuration.
By default, these actions in the audit logging configuration should be like this:
- AuditAdmin : {Update, Move, MoveToDeletedItems, SoftDelete, HardDelete, FolderBind, SendAs, SendOnBehalf, Create}
- AuditDelegate : {Update, SoftDelete, HardDelete, SendAs, Create}
- AuditOwner : {}
By the way, which command do you use to search the audit log?
Mailbox audit logging procedures
https://technet.microsoft.com/en-us/library/ff461939%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396
Best Regards.