Just rephrasing what @cgbsat already said in another way:
New users who only ever used the new shiny Auth0 Single-Sign-on (SSO) don’t have accounts in the old deprecated network.satnogs.org authentication system (although they are able to log-in to satnogs.network.org, using the new SSO).
So they are not able to use the auto-scheduler currently unfortunately.
update: The content of this post might be wrong, see following posts.