You can input your Amazon device activation code at Amazon.com/code, which is the official page used to register and connect Amazon devices to your Amazon account.
Here’s where and how to enter the code:
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When you sign in on your Fire TV, Fire Stick, or Smart TV app, an activation code appears on the TV screen.
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On any phone, tablet, or computer, open a web browser and go to www.amazon.com/code.
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Sign in to your Amazon account.
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Enter the activation code exactly as shown and select Submit.
After entering the code, your device will automatically register and be ready to use within seconds.