My microphone has suddenly stopped working. Why?

[Android Central Question]

Later this day I wanted to call with others on a Discord app using my phone. But I then realised that they can't hear me at all. I've tried reinstalling the app and restarting my phone which didn't help at all. So then I tried to check if other apps can hear me or not. But they couldn't hear me aswell. My phone is Huawei SCL-L01 with Android 5.1.1.

 

[belodion]

If the relevant apps have been granted permission to use the microphone, then it may be hardware failure.