Gear VR and External Microphone

I am trying to use an external headset microphone with an application that I am developing but when I am using the app inside the Gear VR, the inbuilt microphone is used instead. The external microphone works if I use the development mode and run the app outside of the Gear device but as soon as I plug it in, the inbuilt microphone is used.
Is there a known work around for this issue?
This is with the Samsung S6 and building using 5.2.1p3

Hi there,
How did you got the microphone to work at all in the gear?
I can detect the microphone when im running the game in android.
But when i attach the gear vr, it cant detect microphone anymore.
Any tips?