sharing screen with no sound

Hi there,

I am having trouble with Zoom app on my new pc, I bought this new Zenbook (Asus) pc, once I started to have Zoom Meeting, I have trouble with sharing screen sound, my friends can see i share Youtube video but with no sound at all, plus if I hold my phone to play music, they also cant hear the sound from my phone. Anyone knows how to solve this problem? I have zoom meeting on regular basis, its kinda sucks if I cant sharing screen with no sound. I wonder if its my new pc problem or zoom itself problem. I had no problem with my old pc before.

I look forward to hear from others support. thanks.