Maybe check your PS4's settings to make sure voice communications are enabled? The audio pass-through is on by default, but I don't believe voice input is. PS4's settings menu is a bit confusing.

Did you push the slider down? It is down for unmute unlike other headsets. Also check the ps4 audio settings to be sure your mic is turned up enough.

I had this same problem it's honestly hit or miss. It's just a bad headset just plug n unplug till it works

if they have a ps4 join a party with the ps4 if they don't switch the chat voice on ps4 to game mode

Same happened for me, finally I had to buy better ones..there was no fixing them...

I had the same issue when attempting to use this headset. After contacting Rocketfish Support on their forums they determined that the mic showing as "not available" meant it was a faulty unit and I was instructed to return this item. Hope it's not too late for you!

I had to purchase an additional cord straight from manufacturer and connect between controller and headset for mine to work. Currently the PS4 doesn't support bluetooth headsets so a cable for chat function with mic is needed to connect the controller to the headset.

On the PS4 go into settings and under audio make sure that you have it on "chat only", that should do the trick.

Astrogaming.com offers free chat support. They do not require purchase from them directly to receive the support.

My mic works fine with COD. Check to see that the mic itself is plugged all the way into the headset port. That happened to me initially. I did not push them in all the way. Then make sure you check all the plugs from the headset to the mixamp. There is a mute button on the wire. If the red strip is visible it is in mute mode. I do believe there is an on and off switch on the mixamp. Check it to make sure it is lit up. However, I am by no means tech savy, so if those don't work or you have already tried them hit Astro up there have been really cool to work with when I contacted them.