Oauth Authorization Code Grant with DocuSign

Hello, I am trying to authenticate with DocuSign through Oauth following their documentation of oauth https://developers.docusign.com/platform/auth/authcode/authcode-get-token/

The thing is that I am trying to achieve this without using a connected system.

I have created an integration that makes the request of the first step which is:

Which the response according to the docusign documentation should be a callback with a code:

But the response I am getting on my integration is this (the code that should be received is nowhere to be found):

Here is how I have configured the integration:

Does anyone know how to configure the integration in order to get the correct response? What I need is the code that should come in the response.

Thank you!