Is "partial" SSO possible?

It depends on what you mean by “SSO”:

  • If you’re talking about DiscourseConnect - Official Single-Sign-On for Discourse (sso), then you cannot use it alongside other login options.

  • If you’re talking about OAuth2, OpenID Connect, or any of our other authentication plugins, then yes they can be used alongside each other, and alongside email/password login.

Good news on that front - we’ve recently added invite support for DiscourseConnect

And for other login methods:

These changes are live in the latest version of Discourse

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