A one-time password is used for dynamic security of your sessions. A one-time password is sent to the participant's email address when the participant wants to join the session.
First, you must check the "One-time password required" box when you create the session (or when you edit it):
Now a one-time password is required to join the session.
To ensure that the participants also receive the e-mail with the one-time password, you must allow the mail to be sent to the participants.
To do this, click on the participant administration of the session in the overview:
There, either import users or add every user manually:
When adding users individually, make sure that the check mark for mail notifications is set:
Now the one-time password is active and your participants will receive the necessary emails.
How do participants/speaker use the one-time password?
The One Time Password functionality from a participan/speaker perspective is described here.