Mirror my iphone video to a TV I'm sharing in a meeting

[cameopark]

I'm trying to mirror a video from my iphone that is being shared to the people in a zoom meeting.  I have a large group that are watching in person and I want the virtual audience to also see the video.  The sharing of my screen (video) works great but the minute I mirror it to the TV, my iphone screen display a black screen indicating I'm casting to the TV.  Because I'm sharing my screen, this screen is also what the zoom participants also see.  The audio of the video continues just fine for zoom participants.  Is this a problem with Zoom - trying to share and also mirror to a TV screen/projector?