Same (or similar) issue here with both the normal and beta client (version 1736906505) on Arch Linux and Void Linux. The mute switch doesn't work in open mic mode or with push-to-mute. Actually, I can't hear anything in both modes and the toggle key doesn't do anything. Push-to-talk works perfectly fine.
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Your system information
Please describe your issue in as much detail as possible:
When using steam voice chat, in Open Microphone mode, with a key bound to
toggle mute, the bound key does nothing.I'd expect the bound key to toggle mute.
Steps for reproducing this issue: