OBS NDI: Video But No Audio

[OinkQuack]

I use OBS to stream to my channel on YouNow. Sometimes, I am a guest on other YouNow users' channels; this involves being invited to use my webcam. I want to play the OBS scenes I normally stream, but route the video and audio to my webcam. I am currently using NDI 4 Tools; the video is OK, but the audio is not heard.

Assumptions: I do not need to stream to play videos routed to my webcam.

This is my setup, applications and steps:

• Setup
  • Dell XPS 15 9570, Windows 10
• OBS
  • Audio Mixer
    • Video (Media Source) > Advanced Audio Properties > Audio Monitoring: Monitor Only (mute output)
    • Desktop Audio > Advanced Audio Properties > Audio Monitoring: Monitor Off
    • Note: I did this because the audio was phasing between the video audio and the Desktop Audio
  • Tools
    • NDI Output settings
      • Main Output: "OBS NDI Main Output"
• NDI 4 Tools
  • Webcam Input application
  • NDI Virtual Input (in toolbar icon tray)
    • Select: "OBS NDI Main Output"
• Skype (I probably don't need this, but it's useful for testing)
  • Settings
    • Audio & Video
      • Video > Camera: NewTek NDI Video
      • Audio > Microphone: Line (NewTek NDI Audio)
• Firefox
  • Grant permission for younow.com to use the camera and microphone
  • Select NDI source for both camera and microphone