Are there any plans for implementing SAML SSO on SCM

That may already be available. SCM 3 uses the PE Console as it's auth backend: https://help.puppet.com/scm/current/Content/UserGuide/SCM/managing_access_adding_users.htm So, the SAML integration on PE should carry over.

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I see some tickets around adding SAML support, but none are currently in near-term plans or have customer requests linked. Opening a support case with the feature request will help and will give us a place to report back on Product decisions.

I can do that