ローカルログインとdiscourseConnectの両方を使用する方法はありますか？

[Stephen]

AFAIK this isn’t possible:

@sam

What if I would like SSO in conjunction with existing auth?

The intention around DiscourseConnect is to replace Discourse authentication, if you would like to add a new provider see existing plugins such as: Discourse VK Authentication (vkontakte)