Apple TV
What to do when your Apple TV doesn’t want to connect to the WiFi even after restoring and resetting. All other devices are able to detect the WiFi. Is there any other option than using the Ethernet cable!?
no, the only 2 means of connecting the appletv to ones local area network is by wifi othernet
it's not a general issue of not being able to connect by wifi so it could be something with your network configuration or that you have a defect appletv box
testing if it works with ethernet is a way to troubleshoot the issue
testing the appletv on another wifi network like that of a friend and or relative could shed light as to if it's something in your network setup