My computer (Macbook Pro Retina 2015) has 4-pole headphone connector which is designed to transmit stereo audio and receive a microphone, but the microphone portion seems to be broken. Is there any way to use the internal microphone instead in MacOS? When the headphones are plugged in, the option in Sound preferences goes away.

In Windows on the same computer, it's possible to select the internal microphone, so this is a software-level restriction, not a hardware one.

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