Muting local computer mutes the stream

When I start the stream I can still hear local audio + the stream. In FAQ it says “mute the local PC, the stream will continue” but when I mute the PC the stream cuts too.

What am I doing wrong? I’m on windows 8.1.

Thanks

same here, took cheap old headphones snapped the 3.5mm end and plugged it in as a mechanical mute, works now… lol