My headset works, except that microphone, why?

Yesterday in Mediamarkt, I bought a headset for 40 euro.

I tried it today, I hear everything. But the microphone does not work.

I pushed the mic in properly, so it should work.

Play on an Xbox One.

Can someone help me?

Incidentally, the headset is the "SX-6 Stereo Gaming Headset" by gioteck

Try it on the PC, maybe the Micro is just a defect?

I bought new but I try.

Had my mother last week, bought new Sennheiser in the media market, a earpiece was broken.