If your microphone icon has a red slash through it, that means you're muted. Click the microphone icon to unmute it (a pop-up for permissions may appear). The red slash will be removed. Click it again to go back to being muted.
If your microphone icon has a red slash through it, that means you're muted. Click the microphone icon to unmute it (a pop-up for permissions may appear). The red slash will be removed. Click it again to go back to being muted.