Microphones not recognized/working

Hi! I’ve been using Manjaro for a few months now, but the microphones of all my headphones still don’t work. I tried with 2 wired headphones and 1 Bluetooth headphone.
The microphones don’t seem to be recognized at all. I’ve done some research, but nothing solved my problem. What can I do?
(I should mention that the computer I’m using is not a laptop and so doesn’t have an internal microphone)