This guide will let you know how to fix GAME VOICE Chat & Mic not Working in Warzone 2.
First, you have to make sure that you are in the right channel by pressing the options button and going to Channels from the top. If you are on the wrong channel, then you can’t communicate with people. You can hear the squad but they can’t hear you. You need to select the right channel, then press X on it and select the Voice All Lobby option from the top. After that, make sure it is set to All Lobby.

Also, you have to make sure that your microphone is not muted. If you press the R3 button, your microphone will mute and if you press the R3 button again, then you can unmute your microphone. Also, make sure that the people in your channel have unmuted microphones.
After that, click on Options, then tap on settings and navigate to Audio.

You have to scroll down and under voice chat, you will get an option called Voice Chat Volume. To increase the volume, you need to move the slider to the right side, and to decrease the volume, you have to move the slider to the left side. In case you are having a problem with your mic, then you need to reduce the open mic recording threshold. You can also increase or decrease the microphone volume.

After that, go back to the home screen and press the PS button as it will open the control center. Then go to sound to check your output and also your input devices are selected correctly. Also, you have to set the volume according to your choice.

Now do the same thing for your microphone, go to the mic and switch it to the microphone that you want and then you have to go to adjust the microphone level and you can talk in here and see if it’s the good section. After that, make sure your microphone under here is not muted and you’re actually able to communicate with people that could be the reason why you’re not able to speak to people in the game as well you may have muted your own microphone. So if you go to the screen under the chat Channel and press the R3 button, you can mute yourself or unmute yourself. You can find a little cross-out microphone by my party name or a headphone when it’s muted in the bottom right side of the screen, you will see the button to unmute or mute itself. You need to make sure you’re connected to the correct voice chat.
