screen sharing is not working on my mac

We’re going to need more information to hello you, @Dougtechsupport

Have you been through this Zoom Support article?

https://support.zoom.us/hc/en-us/articles/201362153-Sharing-your-screen-or-desktop-on-Zoom

At what point are you stuck, and what are any error messages or other indications you're  seeing?

Hi Ray, thanks for getting back to me.  I'm unsure what the issue is, but I've been unable to share my screen.  Its been a while since I tried it, and apologize that I don't have the specific page where this happens.  Its been pointed out to me that after clicking on share screen, a page comes up with boxes on it, and one of them shows a large exclamation point.  The people on my zoom say they do not see the exclamation point on the same page, and they believe that may be an indication of security setting.  Does this help at all?