When 1st time casting from vCastSender to IFP, MacOS will pop-up a message to ask for audio authorization for "vCastSender". Please choose “Agree” or there will be no sound when casting.

 

To manually allow access, go to:

1. System Preferences > Security & Privacy.

2. Select the Privacy panel.

3. Ensure that "vCastSender" is checked under Microphone.

 

NOTE: Ensure both MacOS and IFP are not muted.