Can not get screen_hint to work

It is the answer — it’s just not working. Here is the call for the Classic experience. Again, straight from

https://start-normal.us.auth0.com/authorize?response_type=code&client_id=bfLYWfl4zuYwS3AtB0m73vyXc0LEK2wn&scope=openid+profile+email&redirect_uri=http%3A%2F%2Flocalhost%3A8000%2Fcallback&autofocus=False&initial_screen=signUp

I’ve tried switching to New Universal, camel casing, snake casing, nothing seems to work.