Hello,
We apologize for the difficulties you may have experienced, when attempting to register a device or app to your Amazon account.
For security reasons, we may require a two-step authentication process when registering certain devices and software applications.
To complete the registration of your device or app, please enter the following One Time Password within the password field on the sign in screen:
xxxxxxxx
This One Time password is time sensitive, so you need to use it within 10 minutes of receiving our email. If your One Time Password expires, please reattempt to register your device with your Amazon account password to generate another One Time Password.
Your Amazon account password has not been modified.
If the sign-in was not initiated by you, please reset your Amazon account password. Information on changing your account settings is available on our help pages.
https://www.amazon.com/gp/help/customer/display.html
Ensuring the security of customer account information is our top priority, we apologize for any inconvenience caused.
Thank you.