Hi @dmaman
Welcome to the Auth0 Community!
I understand that you’d like to utilize a custom URL that would land users on the Signup page with Universal Login instead of Classic.
This can be accomplished by specifying the screen_hint=signup query parameter when redirecting to /authorize, as mentioned in our documentation here.
Additionally, you can find more information on this matter on our following Knowledge Article that goes over redirecting users to a hosted Signup page.
Hope this helped!
Gerrald