Hi darrin175,
Bear in mind the promotion has some restrictions on eligibility seen here:
"Terms and conditions:
- Offer is available for eligible devices for a limited time only.
- Offer cannot be combined with Apple One, or other free trials or offers for Apple
- TV+.
- Only one offer per Family, regardless of number of devices purchased. You can
- share your Apple TV+ subscription with up to 5 other family members via Family
- Sharing.
- This offer is not available if you or your Family have previously accepted an Apple
- TV+ one year free offer.
- Make sure your device is running the latest iOS, iPadOS, tvOS, or macOS.
- Offer must be claimed in the Apple TV app within 3 months after first setting up
- your new device. To see the offer appear, you will need to sign in with your Apple
- ID on your new device.
- Upon claiming the offer, you agree to a $6.99/month subscription that starts
- immediately after the free offer period and automatically renews until cancelled. You can cancel at any time in Settings at least one day before each renewal date. If you cancel during your free offer period, you and your family members will immediately lose access to Apple TV+ and the remainder of your free trial. You can’t reactivate this trial."
If you meet the requirements, make sure you're signed into your Apple ID in Settings and then open up the Apple TV app on a good internet connection. You should be greeted with terms to accept the promotion at that point.
If you do not, contact Apple Support for assistance.
Cheers!