It says to purchase September 10 or after, if it was delivered on that date , you might have ordered it before that and it does not qualify
Apple TV+ launches November 1, featuring originals from the world’s greatest storytellers - Apple
Customers who purchase any new iPhone, iPad, Apple TV, Mac or iPod touch starting September 10 can enjoy one year of Apple TV+ for free
Youll have to take a look in the TV App on Apple TV to see if it works for you.
- In the Apple TV app in watch now, scroll down to the black thumbnail that says try for free, it should pop up right away to confirm, if it’s working for your purchase.
Redeem your free year of Apple TV+ now.
Apple TV+ debuts on November 1. So your free one-year subscription can start on or after that. Here’s how to redeem it:
Turn on your new Apple device and sign in with your Apple ID.
Open the Apple TV app. Make sure your device is running the latest version of iOS, iPadOS, tvOS, or macOS.
The offer should be presented immediately after launching the app. If not, go to the Apple TV+ channel page where you’ll see the offer.
Tap Enjoy 1 Year Free.
https://support.apple.com/en-us/HT210573