I can't find the direction of a sound in my game

Hello, excuse me for my bad english. I need some help. I’m working on a first person game and I want to add 3D audio so the player can understand where the sound comes from. Although left and right audio is okay, I can’t make it work with up and down direction (Z). For example, I have a hallway. I can make the direction of the sound work fine if it’s in front or behind the player (same as right and left) but if there’s a sound above him or below him you just can’t tell where the sound comes from. Any ideas on how to solve this problem?

This is a problem in all games, when only using stereo. It simply can’t really be done :(. Not just in unreal, but any game