A full list of users can be downloaded as an Excel file from the workspace.
Click the Action Menu
Click 'User management'
Click 'Create users'
Click '...or upload Excel'
Click 'Excel file filled with all workspace users'
The Excel file should now be downloaded.
This export includes all users (their email addresses, and first and last names), their role (admin/participant), custom profile fields, and mobile phone numbers, if this information is available in the workspace.