Mac Host with No audio on client

I am using RustDesk app on iOS device to connect to Mac Mini.

I am not getting audio passing through to the iOS app.

I do have JumpDesktop and Splashtop and both of those pass audio to their respective apps. I can alternate between the two, no problem.

Just when I use RustDesk, while it functions fine, I'm not getting audio. Not sure what I am doing wrong. I see my audio device is set to whatever app of Splashtop or JumpDesktop was used last.

I don't want audio coming out of the Mac Mini on the Host but do want audio on the remote session.

Any ideas on what may be the issue?