There are three possible causes of this issue:
Cause 1: Recipient employee does not have a contact type of "EMAIL" assigned
Cause 2: EMS parameters set to 'Test Mode'. Emails will only send to the email address set as the administrator.
Cause 3: Overnight dba job not running/activated.
Resolution 1
Assign valid email address to Contact Type of EMAIL. To do this, follow the below steps:
Navigate to People Management.
Click View on Employees.
Click View on the relevant employee.
Click Actions, then click Personnel Profile.
Update the email address contact type as needed.
Resolution 2
On the EMS Parameter Maintenance screen for live environments, check the Test Mode check box is unticked.
Test Mode should be enabled for UAT/Testing environments to prevent emails sending to employee emails.
Resolution 3
To resolve this issue Support will need to check the overnight job on the database.