I'm considering implementing EE5 with SSO. Does anybody have experience or recommendations for this? I've found a miniOrange solution https://www.miniorange.com/expressionengine-single-sign-on-(sso) that might be good--any comments on that?
If your intention is simply to allow other authentication schemes to act as mechanisms for gaining access to EE, you might get what you need from the "Social Sign In" plugin from Reinos.nl
This does not offer access to the full SSO universe, but potentially covers a large proportion of it.
I have not used this plugin, but can recommend Reinos stuff in general, and commend them for providing good support too: unusual for an EE addon in my experience.