No system audio when joining a discord channel

I had a similar issue and it was being caused by hardware. Specifically, if I had a USB audio device with both input and output and it was selected as the default audio device for both input and output, I'd get no audio. This was specifically a Steel Series USB headset w/mic. When I switched to my Blue Snowball mic (it's an input only device) and headphones (via a Grace m9xx DAC), the problem went away.

I don't know the exact causes but did lots of digging without figuring out the reasons why. Maybe this will help you in your debugging.

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