I only have one account, and I followed the steps in your previous comment.
Regards, Leigh
btan
I would think there is need for the below to enable first to see that option. Anyway the note seems to suggest certain requirements on the account too.
Meeting tab
Security
Require that all meetings are secured with one security option: Require that all meetings are secured with one of the following security options: passcode, Waiting Room, or Only authenticated users can join meetings. If no security option is enabled, Zoom will secure all meetings with Waiting Room. Note:
This setting is required to be enabled for these accounts: single licensed user, Pro accounts with 2 or more licenses, and Business accounts with 10-100 licenses.
After I awarded points, Zoom Support responded with the solution!
You can still enable "Only authenticated users can join meetings" on your personal settings so that it will be enabled on all of your newly scheduled meetings.
https://support.zoom.us/hc/en-us/articles/360037117472-Authentication-Profiles-for-meetings-and-webinars