I would ask you actually to be even more proactive in that regard, having had some HR experience myself.
Sometimes it's difficult for newer employees, employees who are not so sure of their situation, to just understand their pay system, given that we know how complex it is. Regarding managers, it disturbed me as well to hear that at the very onset of the Phoenix system, there were managers who did not know that they had to go into the system and actually approve transactions and interact with the system.
I can sympathize; it's a very behavioural management kind of mechanism. If I get a prompt that I need to do something, I'll go in and do it, but if there's no prompt, I'm going on with my regular day. How could it be that managers did not know that they had to go in and do these transactions?