i have found the following solution on another forum and it did help me:
“I had this same issue including only one mic being displayed.
I have Realtek HD Audio Manager on my laptop (as you likely do)
When you plug a new audio device (like a combined 3.5mm jack for your headphones) it will (most of the time) prompt you if the new device is:
Since speakers cannot possibly have built in microphones, if you pick this it will default to the mic on the laptop.
I dont know if you have this same sound manager, but if you do, you can force to prompt box to pup up
⊞>”Realtek HD Audio Manager”
Look for the panel on the right labled “Analog”
There should be a small folder in the top right corner of that panel.
Click it and enable “Enable auto popup dialogue, when device has been plugged in.”
Hope this helps