A:Answer Please make sure that the microphone is not muted. Put/flip the mic on the down position as this automatically unmute the mic. When you put it back up, the mic goes on mute. Also check if you have chosen the JBL QUANTUM 400 as the default device in the sound settings of your Xbox. Check if the LED light indicator on the mic is turning off. If the light is off, it's unmuted. But if the LED indicator light is on, it's on mute. if the issue persists, Please contact our customer support service via our official website or toll-free hotline