Controlling volume via Keyboard?

Description

After setting everything up (PC audio streaming to phone via WiFi), I now seem to have lost control of controlling my PC audio with my keyboard as I used to do.

It doesn’t even work when I change the volume from the Windows System tray menu.

In order to change the volume I have to open the PC app and control it from there.

Is that the standard behavior?

Is there any way I regain control of controlling my PC audio with the keyboard buttons, or Windows system tray menu?

I think these following issues might be related:

Devices

Phone:
Android 12
Redmi Note Pro 10
AudioRelay 0.26.1

Laptop:
Acer, Windows 10
AudioRelay 0.27.5

I have no problem adjusting the volume on either Windows or Android.

What virtual audio program do you use?