activation error during initial setup and it shows the apple activation server is temporary unavailable

Hey there chiunwen,

Thank you for posting in Apple Support Communities. It sounds like you're receiving an activation error when setting up your Apple TV. We're happy to assist.

Please try connecting to a different Wi-Fi network to activate your Apple TV.

If you're unable to access another Wi-Fi network, please follow the steps here to help fix this: Recommended settings for Wi-Fi routers and access points

Keep us posted on the result.

Have a great day!