How to install a fake audio device in Windows 10 Hyper-V?

I have an application running in a virtual Windows 10 in Hyper-V and the application is detecting that there is no audio device and failing to work. Of course the computer audio works when I RDP into the virtual machine and use remote audio. But the application can't see an audio device. How can install a virtual or fake audio device in a virtual Windows 10 to trick this application into thinking that my computer has audio?

I tried rebooting and connecting with and RDP first to avoid anything happening from the console session to be identified as now audio. But that did not work.

Thanks for every suggestion!