Hello Erik,
Hard to diagnose at a distance, but I’d try to listen to the console to the audio being sent you (or your camera). If the buzz is coming from the console, you have to look there first.
Could be a half million things. From nothing, as in the faders are higher than they would be because no one is talking into the mics, to interference from lights, to bad grounding elsewhere.
I’d try to find the person running the console to see if he/she can fix the feed you’re getting.
Regards,
Ty Ford
Want better production audio?: Ty Ford’s Audio Bootcamp Field Guide
Watch Ty play guitar