Hi, good day!
To help narrow down the cause
Does Device Manager > Sound, video and game controllers show the audio device without a warning/error icon?
When did the built-in audio last work properly, and did this start after a Windows or driver update?
What is the exact model of your AZUS Zenbook?
Press Start then search msinfo to open System Information. Please take a screenshot of the resulting window and post it in your next response.
Please try reinstalling the audio driver through Device Manager
Right-click Start and select Device Manager.
Expand Sound, video and game controllers.
Right-click the laptop's audio device and select Uninstall device.
Check “Attempt to remove the driver for this device.”
Click Uninstall.
Restart the laptop.
I look forward to receiving your update and I'm willing to collaborate with you till we resolve the issue. Do keep me informed by clicking "Add comment" below.