Hi @jonatan.lavado!
Can I ask what SDK and version you are using? Depending on that, the way to send the connection parameter might change. For example, in a SPA js SDK and also the React SDK you have to send it within the AuthorizationParams in the latest versions of the SDK such as:
loginWithRedirect({authorizationParams: { connection: "connection_name" } })
You can see more details of this in the following docs: AuthorizationParams | @auth0/auth0-spa-js and Community post that might be useful as well: Pre-select a single social connection to skip Auth0 login for New Universal login
Please let me know if I can help further!
Thanks,
Mary Beth