Unable to find OAuth 2.0 credentials for an application link in Jira Data Center 8.20

I’m following this article to set up OAuth 2.0 provider for Jira Data Center. While trying to configure an incoming link, I didn’t see the UI to get client id and client secret after I’ve created my application link. This situation is blocking me from moving forward.

This is the configuration panel I could get to with my application link. FYI my Jira Data Center is on 8.20.30 version so I was looking at the documentation for 8.20 but it didn’t seem to be very accurate in saying “After providing the Redirect URL and selecting the scopes, Jira will generate the OAuth credentials that include these details.”