The new iPad Air 2 I bought at Best Buy a week ago will not register with Apple.  How do I register this so that I am eligible for support and 3 month warranty?

I bought a new iPad Air 2 from Best Buy a week ago and it's serial number is not registered with Apple.  According to support I am not eligible for support or the 3 month warranty.  How do I register this thing?


Return it to Best Buy and either get one that can be registered or get a full refund and shop somewhere else.
Brand new iPads have a 12-month warranty.