【What's New】I'm sending a What's New notification to specific employees. Why is it showing that the employee ID doesn't exist?

There are two reasons why the system will show an employee ID doesn't exist:

1. The employee ID was entered incorrectly

2. This account has not been activated; users who have not activated their account cannot receive What's New notifications.

[To determine whether or not an account is activated, please see: [Users] How can I determine if an account has been activated (logged in)?]