When you import subscriber to your list from a file or by pasting in several subscribers at once you will notice that Coupon Carrier won't detect these as new subscribers.
MailChimp doesn't send notifications about new subscribers for connected apps like Coupon Carrier when you add subscribers in bulk. The reason is most likely that they want to prevent someone from inadvertently sending a large amount of requests to connected apps if someone were to import thousands of subscribers at once.
The following events will notify Coupon Carrier of a new subscriber:
- Manually adding a subscriber to your list
- When someone subscribes to your list via a signup form or popup
- Adding new subscribers to your list via MailChimp API