Unable to authorize access while integrating AEM with Adobe Sign

I am trying to integrate AEM with Adobe Sign.

-I have an Adobe Sign trial account.

-I have enabled SSL on AEM.

-I created an Adobe Sign API application as follows: 

-For configuring Adobe sign on AEM, I am using following oAuth URL:

https://secure.in1.echosign.com/public/oauth?redirect_uri=https://localhost:8443&response_type=code&client_id=CBJCHBCAABAAHOgWDXe9RBF6g90koz1UR5nsl1XDM3up&scope=agreement_read:account+agreement_write:account+agreement_send:account+widget_read:account+widget_write:account+workflow_read:account

when clicking on Connect to Adobe Sign I am getting following error: