While two-factor authentication (2FA) isn’t officially available on Amazon UK, there is a very simple way of enabling the feature and making sure that your account benefits from that extra layer of security.

To enable 2FA for your non-US Amazon account, follow the steps below:

1. Go to https://www.amazon.com and sign in using your Amazon UK credentials.
2. Navigate to Your Account and locate the Change Account Settings link under Settings.
3. You may be prompted for credentials again, but after you authenticate, you will be presented with a number of settings. Click Edit next to Advanced Security Settings.
4. Read the information on the two-step verification page and click Get Started.
5. Now you need to make a choice between enabling 2FA using SMS text messages or an authenticator app. Let’s consider each option’s features:
   • SMS text message:
     • Doesn’t require a smartphone or extra software, making it very easy to use and manage.
     • It is only available on a single device. If you lose your phone you may be left without access to your Amazon account until you can get a replacement SIM.
     • Requires cell reception to work.
   • Authenticator app (Authy):
     • It is not dependent on cell reception or a connection to the internet.
     • You can generate codes from multiple devices without relying on your phone.
     • Recovering Authy itself, if you only had it on a single device, is likely to rely on SMS verification as well.
     • Amazon uses SMS texts as it’s backup code verification method in case you lose access to your app!
6. We will go with Authy for this example, although SMS on its own can be just as good in most cases. Click on the Authenticator app option.
7. Scan the displayed QR code into Authy and type the token that the app displays back in Amazon.
8. You will now be asked to enter your backup phone number; any country is allowed. Proceed through the form, verifying your number with the code you’ll receive via SMS.
9. Agree to the caveat and you’re finished!

Caveat: The last step of activating 2FA on Amazon alerts you to a minor inconvenience seen on mobile devices – they don’y support it. You will sill be able to to sign in, but you will have to append the code you receive to the end of your password string.

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TL;DR: Enable 2FA under Advanced Security Settings on Amazon.com and it will work for the UK site.