HDMI Audio works, but unable to control volume. I can control audio using Bluetooth & audio cable

MSI X99 SLI Krait MSI GTX 960 i7-5820k

Mojave is running with everything else working. I can change the volume in the tv, so not a huge deal.

Full disclosure I tried following guides to set it up but kept running into problems until I found a user with a similar hardware setup who had success and copied their MFI folder.

Any help would be greatly appreciated. Thank you!!