Follow these steps to connect Cornerstone via the StackOne Hub successfully.
Login to your Cornerstone portal.
Navigate to Admin > Tools > Edge > API Management.
On the Manage Applications tab, click Register New Application.
Enter your Application Name.
Enter the User ID of an active user in your portal.
In the Scopes section, select the scopes you want to associate with your application.
Click Register Application.
If the User ID entered is valid, the page refreshes and displays a client ID and client secret. Copy both values to a safe place to be used in the next step
Enter Credentials