How to fix microphone not working in Call of duty Modern Warfare 3: this will resolve problems related to the in game settings or other issues related to your mic that prevent it from working in MW3.
That may be caused due the wrong device is selected in game.
Another potential thing that can cause your microphone not to work in Modern Warfare 3 is having it muted.
For Xbox, head to network setting, advanced setting, Alternate MAC address then press clear: game chat will work again .
on PlayStation, go to system settings, reset options, restore defaults.
Those workarounds may fix your mw3 voice chat/microphone not working so you can enjoy playing the game.
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