Zoom will require a passcode or a waiting room for all meetings from July 19
Zoom meetings are required to have either a password or a waiting room from July 19 on. You will find these options from the meeting settings. The reason Zoom is requiring a passcode or a waiting room is to avoid the so called Zoom bombers who have been joining random meetings by guessing the ID numbers of meetings.
1. If you have already scheduled a meeting that occurs after this change and
a) you already have a waiting room or a passcode in use for the session, you don't need to do anything now.
b) you have not set a passcode nor a waiting room for the meeting, please notice that Zoom will set up a waiting room for that meeting automatically. When you have a waiting room in use, the participant will not be able to join the session on their own but you will need to accept them to join.
2. If you add a passcode to an existing meeting, you will need to resend the calendar invites including the passcode.
3. If you add a new meeting with a passcode, Zoom will add the passcode to the meeting URL (= the web address). This means you will not need to send the password separately to the participants, just send them the URL.
For more details, please see Zoom's own article.