Automatic login if user tries to sign up but already exists


We have implemented web authentication in a SPA against auth0 Universal login.
We have set up the screen_hint to signup to facilitate new users sign up.
However, this causes issues for returning users.
The already have an account -> Login interface is not very visible, nor user friendly.

Is there a way for auth0 to automatically try to log in a user if the sign up process fails with user already exists ?

I tried to search for the answer but I couldn’t find it anywhere. Forgive me if it is a duplicate and just point me to the right direction.

Thank you for your time,