Free Apple TV subscription

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, signed in, where you’ll see the offer.

Tap Enjoy 1 Year Free.

Apple TV + Offer

https://support.apple.com/en-us/HT210573

Terms:

Offer must be claimed within 90 days from when you activated the new device 

Your free year of Apple TV+ is included when you buy a new iPhone, iPad, iPod touch, Apple TV, or Mac from Apple or an Apple-authorized reseller. Your new device must also be capable of running the latest iOS, iPadOS, tvOS, or macOS.

For some users, the automated year offer doesn’t seem to work. If you qualify, and if you did as described in the guide, and you still do not get to see the year offer, then contact Apple Support. They can assist in getting you the service, if needed using activation codes.