No audio when monitoring incoming NDI source. However, it IS recording/streaming perfectly fine

I recently upgraded to a new MacBook Pro for our streaming service (using OBS) and am setting up the old computer for someone to use in ProPresenter, and NDI to send me graphics. Today, I’ve been testing it out and ran into a few glitches.

One thing I’m having a problem pinning down is audio being sent through NDI.

On the OBS computer I can see volume input activity from the NDI source, and when I listen to the file recorded, either through “Record” or “Stream,” the sound IS there. It’s just that when I’m trying to monitor it at the time it’s being fed to me via NDI, I am not hearing anything whatsoever through my headphones.

Checking the Advanced (Audio) Properties within OBS, the NDI source is set for “Monitor and Input” with all six channels being checked.

Any ideas what I’m missing?

Running the latest versions of NDI Tools and OBS, on a 2026. M5 MacBook Pro running fully patched macOS Tahoe.
The ProPresenter machine is a 2020 Quad i5 MacBook Pro, running macOS Tahoe with current ProPresenter and NDI Tools.