How can I use Apple TV free for 1 year?

hello,

I bought apple tv about 3 months ago and i bought iphone 11 pro max about 2 moths ago.

when i watch apple tv, i saw a message/note like “you can use apple tv free for 1 year, because you bought a new iphone” and i tried to add payment method to use the apple tv free for 1 year. then, i added my payment method. but the message disappeared now.

how can i use apple tv free for 1 year. i need your help.

[Edited by Moderator]