How do I fix my authentication problem on my kindle fire?
Why is my Kindle Fire not connecting to the Internet?
Make sure that Airplane mode is off. Confirm that your device has the latest software version available. Restart your Kindle and any network devices like modems or routers. Attempt to connect your Kindle to Wi-Fi again or add a network manually.
Why is my Amazon Fire tablet locked?
If you enter the wrong password or PIN too many times, your Fire tablet will temporarily restrict you from entering it again.