Many reasons can be there when you are unable to register kindle. This is most important thing to consider as whenever you want to make use of amazon devices you need to have amazon account. However, in case you have a kindle which is get utilized by other kindle device then you won’t be able to access it.
The device can control only one account and the same account cannot get use with other kindle device until the process to register kindle is not done. Although, you can remove unable to register kindle issue by making use of option Manage my kindle available in menu section.
You need to assure that your kindle account is not register with other gadget. In case the requirement is to fix unable to register kindle error then get register kindle once more.
To fix unable to register kindle
issue you need to wait for at least four hours. If there is any issue occurring when you are completing process to register a kindle then confirm that similar account is not register with some other kindle eReader.