I already passed offer signature and other require parameters. Also I used "promotional offer" instead of "introductory offer". I uploaded images for your reference. Thanks for support.

I’m pleased to share that I’ve successfully achieved a promotional offer with the assistance of Apple Support. Their guidance and professionalism made the process smooth and efficient. For those exploring similar opportunities or seeking clarification on promotional terms, I highly recommend reaching out to Apple Support for personalized assistance. Their team is well-equipped to address queries and ensure you make the most of your Apple experience. If anyone has questions about navigating promotional offers or the process, feel free to ask—I’m happy to share my insights!