Microsoft Exchange Active Directory is required to assign a manager to a user. To
successfully send an email for manager approval if sensitive data is detected by
Enterprise DLP, the sender must have a manager assigned.
If no manager is assigned to the sender, then the email is sent to the recipient
because no manager is assigned to approve or reject the email.
Additionally, Microsoft supports email approvals on the web browser-based
Microsoft Exchange only. Approving or rejecting emails on the Microsoft Exchange
mobile application or desktop client is not supported.