...
Log into the Zoom web portal and navigate to the “Reports” tab. From the available reports, select “Usage,” set the date or date range of your class, and click on the participant count (far right) of the meeting/webinar you want to review.
Click the “Export” button and export this list as a .csv file.
Open the CSV and copy the list of email addresses.
Navigate to the Course or Session and download the import template.
Paste the list of email address into the “external_email” column and save the file.