I am prepping a meeting and with a few people we were able to make each other co-hosts. Then we were trying to share the screen to see the zoom settings but the other people weren't able to view what I was viewing, only my home screen. Why is that? 

I set a facebook ads campaign with the subscription link provided by zoom webinars, now, suddenly it stopped working and people can not subscribe from the link that 15 days ago was working properly.

The last time i launched a webinar, happened quite the same, when i started the webinar, my susbscribers could´nt conect, they said that , when they pressed the "join webinar" button from the confirmation e.mail sent by zoom, there just show the message "waiting till host start this webinar", but it has already started

i have not changed the suscription link , could somebody explain me why is this happening?

I recently put the Umbutu OS on my lenovo laptop and now my Virtual Bacground wont work, also All I get when Zooming is Black screen and no one can see me.. Is it Zoom or my operation system? Do I need to download a new Zoom app?  Or what can I do to fix this?