External microphone not functioning

Hi..
I'm having problem to record voice using my external microphone on my Realme 6 device. Its only record audio from internal microphone even the external microphone connected to the phone.

This what I've done:
1. Using 3 external microphone, different brand: giving the same result: not recorded from external microphone.
2. The same external microphone had been tested on: Huawei Mate P20, Samsung Note 5 and iPhone 6: working fine & smooth.
3. Using the same 3 external microphone to other...

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