iPad mini2 video and audio shared via Airplay on Zoom (video working for all, audio only for host)

Hi, I have a problem with Airplay and Zoom.

When I share the sound and video of my iPad mini 2 (iOS 12.5.5), I can see and hear it well on Zoom if I am the host. But all the other people can only see the video without hearing the audio of it. The same thing happens if I record on Zoom. The recording has the video of the Airplay but not the audio.

I hope someone can help.

Thanks in advance.