After you purchase Amazon subscription plan, it is necessary to link devices with your Amazon account at Amazon.com/mytv. This lets you access whole library of awe-inspiring Movies, TV Shows and Amazon originals.
Use Amazon.com/mytv to Link devices
Open Amazon App on Android TV.
Now Log In your Amazon account. An activation code is shown on your screen.
Visit Amazon.com/mytv through web browser on another device - Smartphone/tablet.
Enter the code on the Netflix activation page.
Further, sign in Amazon account with Login credentials.
A Confirmation message is mailed to you and is displayed on TV screen too.
Choose Start Streaming and watch Amazon My TV on your linked device.