When you register through Eventbrite, you’ll never get a DIRECT link to the online event.  In your Confirmation email (from noreply@order.eventbrite.com*) there will be a View the event button:

The View the event button will take you back to the Eventbrite page for your event.  There, you’ll find the Open in Zoom link.  Keep in mind that this link won’t be active until 30 minutes before the event starts.

You will also get a reminder email from Eventbrite the morning of the event.