Can not find if here is microphone driver installed

In the skypeforlinux and facebook-messenger applications I could not use the built in microphone.
Also I could not detect a microphone driver installed in the software updater:

There won't be a 'microphone' driver. You need to check you inputs in Sound/Audio.

Okay, but still nothing I can find:

Have you checked using the PulseAudio app?
https://linuxhint.com/pulse_audio_sounds_ubuntu/

Similarly:

https://askubuntu.com/questions/6993/in ... ot-working

Something happened...
It seems it can not use the laptop internal microphone, but after switched using headset there is microphone device:

This seems to work quite well, but sometimes it happens the "Teams" -application can not still find the microphone
even I can see in the ZorinOS sound settings there is some sound input available.

Probably because it is a M$ application!

You would be far better holding secure meetings using https://meet.jit.si - our leader of the local City Linux User Group (LUG) hires a server from Digital Ocean for £5 a week running a jitsi server for our meetings during the pandemic. I use waterfox and able to use Webcam with built in audio without any issue - and it will be more secure than Teams. Jitsi is used by reporters who operate in unfavourable countries as it has true end-to-end encryption - you just have to make sure you set up an obscure meeting name and a secure password for other members to join which you can copy and paste in email or text (jitsi meet is available in Android and Apple Store.