Follow some troubleshooting steps mentioned below:
# Turn off the Wi-Fi connection option on your device and turn it back on.
2. Restart your Kindle/e-reader device. After turning it back ‘on’, try connecting with the wireless network. If still unable to connect, try the ‘forget network’ option and then rescan for your Wi-Fi network and try connecting.
3. Reboot the modem, if the Wi-Fi connection doesn’t show up, try scanning for available Wi-Fi networks. If it still doesn’t show up, add it manually under settings on your device and connect.
4. Check if your internet connection is working properly, in case it is not and if the problem doesn’t get solved by a ‘router reboot,’ contacting your internet provider will be a good idea.
Hopefully, this solves your problem. However, if the problem still persists, try resetting your e-reader to factory settings (this solves almost all problems). If still facing issues, contact a technical support service at 1–800–986–4764 to guide you through the troubleshooting process.