First of all to make sure the regulator is not passing the air, press the hammer to the valve(this step is clearly shown in the video linked below) if the valve gets pressed and still no air comes out that means there is something wrong with the regulator, but if you cannot press the valve(...
I think there is problem in the regulator, its piston is stuck which is not passing air. 1) return it to the supplier to get it fixed OR 2) degas the air tube, remove the regulator, disassembly it, clean it, hopefully it will work.