Virtual (AR Content) Object Not hidden by real physical objects

I'm using the latest version of Vuforia and the suggested version of unity. Everything builds perfectly as an IOS app when I create an Area target app.

I'm doing a simple hello world cube. The problem is when using the IOS the AR content (the cube game object) is not being hidden by real physical walls. I have not seen anything addressing the issue anywhere surprisingly. Can't believe I'm the only one with this problem.

...and yes, Add Occlusion Mesh is checked.

Thanks in advance