Missing "Share content" button in MS Teams Live event

Laura2021 The reason you don't see that specific Share button (from the video) is because that is from the older version of the producer console. We released a new version (it pops out as well) which includes the new Share tray (which is in the upper right, as you noted). When I click this I am presented with a selection of which desktop/window I would like to share:

I can then select something (in this case my second monitor) and add it to the queue (notice my producer window is still available):

And then send it live. Now, a few other notes:

1. Once desktop sharing is live, the next person to share content will automatically go live - that is by design, always been this way with Live Events (we don't have a way yet to queue up multiple screen shares).

2. You cannot upload a PowerPoint in a Live Event - we only support sharing of the desktop, or window/app.

What are you seeing when you start sharing? Does the producer window minimize  to the call monitor in the lower right? If so, you can click that to bring the producer window back into focus.