How to Integrate Webform with Mailchimp (Drupal 10)
1. Install Webform Mailchimp, Mailchimp and Webform modules using composer
https://www.drupal.org/project/webform
https://www.drupal.org/project/mailchimp
https://www.drupal.org/project/webform_mailchimp
2. Go to https://us1.admin.mailchimp.com/lists/
3. Add a New List https://us1.admin.mailchimp.com/lists/new-list/
4. List Name: <name of the list>
5. From Email and From Name
6. Campaign URL Settings.
Choose a verified Campaign URL Settings