Authentication section empty in /wp-json/

Hi,

I have installed and activated this plugin, but when I go to the API index of my site, https://www.gizmopress.co.nz/wp-json/ , the authentication section is empty.

As far as I can tell from the following article, it is not required to do so, but just in case I have set up an application under Users / Applications in WP Admin.
https://mindmapengineers.com/mmeblog/wp-rest-api-setting-and-using-oauth-10a-authentication

That article happens to mention “If the OAuth API is not enabled for a site, the server response would contain an empty authorization property value”, but I have no idea what that means “OAuth API is not enabled”?

Any help please.

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