MY first guess is the pin out on your HDMI cable isn't compatible.
HALO DAC I2S question
I just received my new HALO MAY DAC and in trying to hook it up to my PS Audio Airlen’s I get no sound with the I2S connection. It works fine with a digital cable hook up. The same thing happens with my CD player trying to use the i2s connection. I’m befuddled.