Audio share, microphone not picking up

For work I need to share audio and be able to talk over it while recording the session. 

I use a MacBook Air, have a payed zoom account, latest updated zoom version for Mac, no error code 

when I launch a meeting >  I join with computer audio.

press record session

go to share screen 

> advanced

computer audio

I play music through QuickTime (latest version for Mac) 

when there is no music playing the mic picks up on my voice perfectly

When the music is playing the voice is not picked up of just slight mumbling is heard. 

So this is the problem. 

I have added screenshots of the audio settings. 

Would love your help on this behalf!