I am using the AMD High Def Audio Device through Display Port and have speakers plugged into the headphone out plug on my monitor..
Give it try, I also had to turn the volume on the monitor OSD up to full..
AMD Ryzen 9 9900x, Asus Prime X 9070, Asus Crosshair X870E Hero, 64gb Kingston DDR5 6000, Samsung 980pro 1tb NVME, Samsung 970 EVO Plus 1tb NVME, DeepCool Mystique 360 AIO, Antec Titanium 1000w.