How can I get the 3 month free trial of Apple Arcade with my new iPad Air M2?

I just got a new iPad Air m2. In the app Apple Store it said I would get 3 months free of Apple TV plus, Apple fitness plus, or Apple Arcade. I really wanted Apple Arcade and when I got the iPad I couldn’t figure out how to get it. Maybe it’s because I got it from the physical store not the digital one? Somebody plz help.

[Re-Titled by Moderator]