meeting admit

I had scheduled a meeting using my password and login at work to use later in the evening at home. I generally use it at the office with no problem. However, when attendees started showing up they said they were waiting to be admitted. I searched everywhere on the zoom page but never got any admit source.  Someone else had to send a link to set up another meeting.  Why would this happen and what can I do to make sure it does not happen again??