Whitelist users in Auth0

I've created an app that uses Auth0 for login. I have google-oauth2 enabled for the app. What I would like to do is have a whitelist of approved users ...

Please why does this work when client_id is empty here

Hello im new to auth0 and i want to know why is this working: im making a post request to /dbconnections/signup with this body : this returns “conn ...