FortiPAM : Email Approval Template and Email settings issues

[henry63]

I am facing issue in FortiPAM email approval workflow. We don't have any mail server in our organization. We use Microsoft Mail Exchange Server for mail service. Let's say, there are user1(approver), user2(requester) and user3. If user2(requester) request a secret, a mail sent to approver inbox. If approver click "approve button", it created new mail. but it doesn't any approve at requester end. 
We also cannot use email test connection to gmail account for 2FA purpose.