Make sure the Wi-Fi network is a 2.4 GHz network. The Plug will not connect to a 5 GHz network. If your smart plug is already on the right frequency, make sure that your phone is not using a VPN app in the background.
Test your Wi-Fi network with other devices such as your phone to make sure it is operating properly.
The Wi-Fi connection may not have good coverage during set up. Try moving the Plug closer to your Wi-Fi router. You may also need to improve your Wi-Fi network coverage by upgrading your router or adding a range extender.
Your Wi-Fi network password is case sensitive, make sure you are entering it correctly.
The Plug must be blinking rapidly to connect. If it’s not blinking rapidly press and hold the power button for five seconds until it is blinking rapidly and in pairing mode.