New Apple TV User: 3-Month Free Trial Missing After Using QR Code

Hi everyone,

I'm a new Apple TV user. Yesterday, I bought a Samsung S90D 48" TV and wanted to redeem the advertised 3-month free trial of the Apple TV subscription. I created an account using the QR code displayed on the TV, but I only received a 7-day free trial instead of the 3 months.

Did I do something wrong? Does the 3-month trial activate after the first subscription payment, or is there another step I need to follow?

Thanks in advance for any help!