where are notifications in Zoom on a desk top iMac?

I could not login to Zoom on my iPad today because there was a message saying I had to verify in my notifications on my other device where I use Zoom which is my desktop iMac.

But I could not find where the notifications are. Where are they on the desktop version of Zoom?

Why does Zoom periodically ask you to verify your account on a different device to login?
This is very annoying.