SSO Implementation


I’ve got multiple modx cloud instances running and I’ve got administrators that have accounts on all of them. I am looking for a way to implement SSO (Single Site Login) on all of them, so there would basically be one user account they would have (and if I get a new administrator, I can just create one account and they have access to everything.

Is there something already made for this request? I am currently looking into sessions, LDAP and oauth. What would be the best way to approach this?