Why can't I register my device - Amazon Kindle Fire HDX 7

If the device is purchased with a diff account you need to follow deregister process first. There can be an issue with the network too as device will no register without active internet connection. here are the steps to register kindle device.

• From Home, go to Menu, and then select Settings. Then select option My Account (newer generation devices) or Registration (earlier generation devices)
• Now you get 2 options if you have an existing account or need new account. Select the appropriate option and follow simple onscreen instructionss or contact kindle support
• To deregister the Old Kindle:
  
• From Home, go to Menu, and then select Settings. Then select option My Account (newer generation devices) or Registration (earlier generation devices).
• Now hit Deregister Device & If prompted, select Deregister again to confirm.

Once you are done with this process proceed with the registration steps again and make sure you have the correct password to successfully register your kindle device . Now can register kindle device from a computer or from device itself.

Contact Amazon customer service by phone about this.

For that I'd go to amazon.com click help( just under the search bar)
click manage devices, Click contact us on left side of screen. fill in info about problem. You have a choice of reply methods and I usually go for call back. They are fairly quick and will talk you through the fix.

Log in and click on "Your Account" and under Kindle Help click on Kindle Help Home.


Next click on Manage Your Content and Devices to the far right



Next click on Your Devices and it will show all your registered computers and devices


Select the device by clicking on it and you will get the opportunity to either edit it or deregister it.

just log into your account an check the settings for that device , i have several i manage but no errors yet.

When you turn your new kindle on it should ask you to register it. If it doesn't then pull down the top bar (on kindle fire HD) and choose "more" on the settings list. Look for the "device" option and open that to register it. Make sure you have wifi turned on first.

You can re-register your Kindle through the device itself. Go to the "Settings" menu, select "Register," and then enter your Amazon account email address and password to connect your device to your account. If you do not have an Amazon account, you are prompted to create one.
Can You Re Register After Deregistering on Kindle The Classroom Synonym

Usually the Kindle comes pre-registered to the name used for purchasing it.

However, to register to a different name, open http://www.kindle.com on a PC. Log in using your existing Amazon account or create a new one, following the directions on the web page.

If your Kindle was not registered yet, you can add your device by clicking on "Register a new Kindle" and enter your serial number.

If the device is registered already, it should show up in the list displayed.