Rock Pi 4B - 3.5mm audio jack with mic not working

Hi all,
Im using Android 9 tablet version on rock pi 4B. Audio output is perfectly fine, but microphone is not working. I’m sure that my headphone is 4pin connector.

Any idea?

Thanks.

Hi, @ryan.low, I am facing the same problem here… Were you able to solve it? Could you get a bluetooth device to work instead?