Apple tv

It is not automatic. You would have to redeem the offer to get the one year of Apple TV+ for free¹.

Read here how to redeem: Apple TV+ - One Year Offer - Apple

Read here about the conditions: Apple TV+ one year offer - Terms and conditions - Apple

Read here if you have trouble redeeming: If you can't redeem your promotional trial of Apple TV+ - Apple Support

If you are eligible and are unable to claim the offer then only Apple support can help sort it out.

Did you read the last link? Step 5 has the last resort assistance of the Support staff.