If you got a new device, let’s say a TV (or Smart TV) and if you want to connect your Amazon Prime Video account with it, then this is how you should do it. It doesn’t matter if you are using Google Chromecast or Amazon Fire TV Stick.
When you access Prime Video and log in for the first time, you’ll get a notification message with a code like this:
You just have to visit Prime Video - My TV, log in using the same account details and enter the code here. That’s all.
The device will be registered to your Amazon account after that.
You can see the notification on the TV as well like this:
You can now use your TV to watch Amazon Prime Videos without any issues. Let us know if you have any queries.