I have two applications setup on one Auth0 tenant. Is it possible to setup two different behaviours when entering those apps without modifying application code?
So that when entering Application A - login screen will be displayed, but when entering Application B - signup page will be displayed
You’ve provide the exact documentation needed for your desired use case, but unfortunately this behavior can not be achieved directly through the Auth0 UI, but only by modifying your Application B code when it comes to your /authorize call to include the screen_hint=signup parameter.
Even though Auth0 Actions provide a lot of flexibility when it comes to specific configurations, they usually trigger after the login/signup screen has already been displayed and used, so it does not come handy in this case.