Thank you for the confirmation0. :) Since it's plugged in with 1 3.5mm jack (Combo jack) which is the correct way, let's try to check if the microphone is in the correct input. Go to "Settings > System > Sound" and ensure that the microphone you want to use is selected under the "Input" section.
Please let me know if this works for you. I'll do my best to respond as soon as possible.