We’re unable to validate your product’s purchase date.

Vintage products are those that have not been manufactured for more than 5 and less than 7 years ago. Mac, iPhone, iPad, iPod, and Apple TV vintage products continue to receive hardware service from Apple service providers, including Apple Retail Stores, subject to availability of inventory, or as required by law.

https://support.apple.com/en-us/HT201624

First of all, there are no 2011 MacBooks, there are 2006 to 2010, 2015, 2016, and 2017 models.

So perhaps you have a MacBook Air or MacBook Pro.