apple care

What methods have you tried? See the following (including the phone number) from AppleCare Products - Mac - Apple

How to buy

1. Purchase AppleCare+ with your new Mac.
2. Or buy it within 60 days of your Mac purchase:

• • On your device (go to  > About This Mac > Support)
  • Online (requires you to verify your serial number)
  • At an Apple Store (inspection of Mac and proof of purchase are required)
  • By calling 800-275-2273

How long ago did you purchase the Studio and from where? It may take a little while. In any event, if all else fails call the phone number in my previous reply.

Was the system purchased in the USA ? Systems purchased outside of the USA can’t be enrolled in the USA, I don’t believe that’s allowed.