I have an ASUS laptop and a Sennheiser headset. When plugged in the mic isn't working.

hesof4

Estimable
Oct 2, 2015
1
0
4,510
I have a pink/green splitter, doesn't make a difference. Laptop mic gets disabled, headset mic is not recognized. UGH!!!
Additional info: Windows 10.
 

Unkk

Honorable
Apr 20, 2012
24
0
10,590
There are two different specs for single plug audio cables.
Here's a diagram of what I mean:
Swap.png

It's likely that the mic and ground are revered on yours.
This can cause issues when the mic signal is used for common on the headphones.
I've had this happen too.