When it comes to communication, there seven dimensions to consider if you want to communicate in a way that limits damage to the reputation of the organization. There may be limitations on what you can say for legal reasons, but the nearer you get to covering the seven dimensions, the more effective your communications will be.
If people believe they do not all have the same chance of gaining a reward, they switch off and become de-motivated.
Recognize that people are different. Get to know your people and find out exactly what it is they need from you to succeed.