@Tunir Hello, 

Tapo camera only supports 2.4Ghz Wi-Fi, so please confirm your router is broadcasting a 2.4Ghz wifi. 

It is recommended to change 2.4Ghz Wi-Fi channel to a channel among Channel 1- 11. 

If still the same problem, may I know the model of your wifi router and a photo of wireless settings on main router, thanks

@Tunir Hello, 

Thank you for your reply. May I know tapo setup failed at which step? Please share a photo of the Error message with us, thank you. 

If the set-up failed at the last  step after you put in Wi-Fi password , you could also try some suggestion here:

• when you configure the camera, please make sure the camera is close to the router and Tapo app is up to date on your phone.
• please verify your Wi-Fi password by forgetting your Wi-Fi network on cell phone :  

Go to Settings-> WiFi on your phone, Tap (or Long press  the router's WiFi name  ->Forget / Delete the network 
Please reconnect to your router wifi and it will ask for a password, will it accept your router password?

•  0lease check if main router has Advanced settings like  Access control/ parental control etc. that may block the camera
•  change wireless security of router to WPA/WPA2-PSK
•  change a different Wi-Fi channel 

If issue persists, please let us know the steps you have tried, and help confirm some details here:

1. May I know the model of your wifi router and have a photo of wireless settings on main router: 
2. How about your network topology:
3. Model of your phone and its IOS / Android version:
4. Led Status on Camera after set up: 
5. Tapo app version