Microphone disabled when headphones plugged in

[MyBigRed1]

I have a T-Mobile Galaxy S5 and when I have my Sony headphones plugged in the microphone is disabled. This worked fine on my Galaxy S3, does anyone know why this would be?

 

[johnblack123]

I have exactly the same issue. Also t-mobile s5. Microphone deactivates when I plug in my Sony MDR-XB500 headphones