That's a removable mic on the headset, I'd guess you did not plug it in all the way. Try re-seating it. If it's tight in the plug, test it with a few other things. If the issue happens on every device, exchange it.
That's a removable mic on the headset, I'd guess you did not plug it in all the way. Try re-seating it. If it's tight in the plug, test it with a few other things. If the issue happens on every device, exchange it.