If I try to log in without publishing the application, the obstacle I encounter is "this application is still under development". If I try to launch the application and try to log in from my react application, the obstacle I encounter is "You will not be able to login with facebook until your application updates the security rules.". How can I solve this?
you are trying to login with HTTP, that's why you still got this error
you need to use HTTPS in dev-environment, try to install local SSL Certaficat Or use Ngrock
this article explains to you why this keep happening to you.
https://developers.facebook.com/blog/post/2018/06/08/enforce-https-facebook-login/