Why do I have to keep signing into Amazon Prime on my TV?
Why Does Amazon Keep Asking You to Sign In? Sometimes, you aren't actually logged out from Amazon, even though it might seem like it. Amazon asks for your account information so that they can confirm your identity. This issue can occur while you're making an order, or when you want to change something.
How do I log into Amazon Prime video?
Open the Amazon Prime Video app or download it from your living room device's app store. Register your device by selecting "sign in and start watching" to enter your account information directly on your device or choose "register on the Amazon website" to get a 5–6 character code to enter in your account.