How to use NC as Oauth Provider?

I would like to use NC 14 as Oauth Provider and following this page https://docs.nextcloud.com/server/14/admin_manual/configuration_server/oauth2.html#add-an-oauth2-application there should be a section in admin/security. It is also shown as image

But there is nothing like that in my NC 14, do I need to install an app which I cannot find?