@Solla-topee 

Ηι,

The feature I'm asking for is exactly what's shown in the photo. It's in the yi home app, and it's essentially a 4-digit code on each camera that the user can set as the default. This code is also requested whenever the user wants to change critical settings in the app, like a new email and password.

  @Solla-topee 

Thank you very much for your response. This feature is one level further towards the security side. I estimate that it is not difficult, it is just that perhaps tplink has not considered it necessary until today. Operating systems are relatively easily hacked today and the camera lock code adds a much greater degree of difficulty to have someone access to a specific app inside the OS.

Why would a friend or a child of mine etc... who could have access to my cell phone for a few minutes be able to access the security cameras or the security camera account information, with the ability to intentionally or unintentionally change something?

Best regards