Look in your Okta org for the OpenID Connect client app you identified or created in the Prerequisites section. Users that sign in for the first time are created in Okta and associated with this application.
Assign the app to everyone (the default on creation) or a particular group that you'd like your new SAML users to be associated with. If you want to change the default assignment from Everyone, modify the app assignment from the Developer Console:
Select General and copy the Client ID (
client_id) of the application for use in the next step.