Apple TV+ for amazon Mac purchase

”This limited time offer applies to both new and refurbished models, including devices from the iPhone Upgrade Program, is not restricted to any specific sales channel (e.g., Apple Store, resellers) and will be available in all countries where Apple TV+ will launch”. 

Apple TV+ launches November 1, featuring originals from the world’s greatest storytellers - Apple

contact Apple support

If you bought it from Amazon themselves as an authorized reseller, then yes. Purchases from third party resellers that sell through Amazon are not eligible for the offer.

Redeem your free year of Apple TV+ - Apple Support

Contact the Apple Support staff for assistance. They can help you get the promised first year subscription for free, using activation codes, if the regular redeem procedure doesn’t work for you.