Hello @yayio 

Thank you for let us know the troubleshooting steps you've tried. 

May I know the WiFi Led status on smart plug after set up, it is flashing green or red? 

• Make sure VPN is off on the phone
• You may try a different phone if you have a different phone 

If Led is red/flashing red: 

•  Confirm the Wi-Fi password is correct. You may create a Guest Wi-Fi network with simple  SSID & Wi-Fi password, e.g SSID:  test , password 12345678. 
• Try to temporarily turn off advanced Wi-Fi settings to help exclude the issue, like Band steering, or Mesh 

If Led is green/ flashing green:

• Check if there is any advanced setting restriction settings like Mac filtering,  access control, Whitelist, blacklist etc.

May I know the 1)  model number of the router,  firmware version of router 2)  Can I have a photo of Wi-Fi settings on the main router. 

3) At which step the tapo set-up failed, a photo of error message 3) model of phone and its Andriod or IOS version 4) Tapo APP version, thank you 

Hello @yayio 

May I know did you get Tapo P100 connected using the Tapo APP , was the app downloaded in Google Play or APP store?