Why Auth0 sandbox?

Hi!

I am new to Auth0. My question is why after opens Auth0 lock widget and I click on “Log in with Twitter”, I am redirected to twitter auth page, and there I see that “Auth0 Sandbox” asks my permission. Why “Auth0 Sandbox” why not real Auth0? I haven’t found any option to swith my auth client to live mode from sandbox or something…

Am I that limited on free account?

That is because your Twitter connection is still using the Auth0 dev keys. You will need to configure your own keys in the connection settings (Dashboard > Connections > Social > Twitter). The instructions for obtaining these are here:
https://auth0.com/docs/connections/social/twitter