You might encounter the error message “Meeting request email cannot be restored” in the Backup Archives (Status column) page/Dashboard (Backup Health section)/Backup Health Status Report.

This is a permanent error.

Error Message: Expired mail events cannot be restored

The restored Office 365 email is a meeting request email. Since the meeting has ended, this meeting request email cannot be restored. When SysCloud makes a request to restore this email, Microsoft API validates the email and returns an error implying it cannot restore the meeting event email as the meeting has ended.