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The Audio Out module is used for audio devices and not for video devices like RTMP.
You could expose audio just as you exposed the videos: https://aximmetry.com/learn/virtual-production-workflow/preparation-of-the-production-environment-phase-i/scripting-in-aximmetry/flow-editor/flow-editor/#exposed-video-output-index
Or use the Video Out module instead of the Audio Out module:

Warmest regards,