One of the reasons why your Insignia Fire TV Wi-Fi connection will not work is if there is a problem with the network settings of the TV. The quickest way to fix this is by performing a network reset. Make sure to know the Wi-Fi network name and password before proceeding with this ...
If you're your Insignia Roku TV won't connect to WiFi, we have a step-by-step guide to help you try and fix it.