Hi, Michael.
Enable the remote audio and microphone devices over RDP
If your VoIP application isn't detecting your microphone input or audio output, the first thing to check is your RDP client settings.
- Open advanced RDP settings
In your Remote Desktop Connection window, press Show Options to access the advanced settings menu.

- Switch to the 'Local Resources' tab and open remote audio settings
You'll find the option underneath the Remote audio heading and the sub-text Configure remote audio settings. Press the Settings... button to continue.

- Tick 'Record from this computer'
While you're there, ensure Play on this computer is ticked and press OK. At this point, check your VoIP application to see if the 'Remote Output' input and output devices are available. If they still aren't working, continue to the next step.

- Add roles and features to your server
Source: https://bitlaunch.io/blog/how-to-enable-remote-audio-microphone-remote-desktop/