Netflix Desktop no sound hdmi

Hi,

I have installed Netflix Desktop on my htpc with ppa:ehoover/compholio. Sound works with pc speakers plugged into sound jack but not with hdmi. I need it to work with hdmi and I cant see anyone else with the sound issue. Sound is running perfectly through hdmi when running video and music using other programs.

I have also installed Netflix Desktop on another PC running elementary os with a different video card and I have the same issue.

Any help would be appreciated.