You could do the following steps provided by the link below.
How to fix the Sound (Speakers/Microphones) problems on ASUS laptops – Troubleshooting
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My internal microphone on my laptop randomly stopped working. I noticed this on MS Teams, where it gives me the message that my internal microphone is not working (suddenly). I also have ASIO installed on my pc. For programs that have the possibily to use ASIO, the mic does work. So the microphone it self is working. I've already updated and reinstalled drivers, but this didn't do anything. I use a ASUS Vivobook Pro with Windows 10
Any idea what the problem may be?
You could do the following steps provided by the link below.
How to fix the Sound (Speakers/Microphones) problems on ASUS laptops – Troubleshooting
Hi,
I noticed you said the issue only occurs on Teams application, right?
Try to reinstall Teams to check if it persists. Try to update the system through Settings\Update&Security\Windows Update and install the latest sound driver from ASUS website.
We also could contact with Teams support to check if they have any thoughts about your issue.
https://techcommunity.microsoft.com/t5/microsoft-teams/ct-p/MicrosoftTeams
Bests,