Sometime user might come across Wi-Fi connectivity issue while using the Fire TV device. More reason behind this error such as wireless router, router configuration, wrong account setting, wrong Amazon account, outdated software version and more.
If you are recently moved to another country then change the country and language in account setting. Otherwise, you can get error “Fire stick won’t connect to Wi-Fi” as well as” Registration Failure Error”.
You can try restarting your device or Wi-Fi modem. If restart doesn’t work to [https://firesupportonline.com/troubleshoot/fire-stick-wont-connect-to-wi-fi/|troubleshooting fire TV won’t connect to Wi-Fi] then you have the option to reset your modem.