vega 56 hdmi audio

I've just recieved a Sapphire Vega 56 Pulse from Overclockers and I cannot get HDMI audio. I am using it with Windows 10 latest on a MSI B450M Mortar motherboard with a Ryzen 5 2400G. I have tried everything I can think of including changing the HDMI cables. Different monitors/TV/AVR. Driver...