Send it back to the retailer you bought it from while you can.
I had a similar problem with the mil-pro earmor headset and PTT and went through the whole trouble shooting process with the retailer, which involved replacing both the headset and PTT, and even then neither system ever worked!
Earmor PTT are terrible quality (currently) so it’s worth looking at other brands. I’ve gone for Peltors which have worked fine from day 1.