The “Discourse SSO” system you’re looking at is intended to support integration with custom authentication platforms that completely replace Discourse’s built-in authentication system. In the case of common social platforms like Google, what you’re looking for is “social logins”, which can co-exist alongside other means of logging in. To configure Google logins, you’ll want to follow this guide . There are similar guides for other social platforms, if you wish to allow login from those, too.
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