There are two options to onboard users when you have SSO enabled. For private sites, the Admin can send the link to the site where users can log in via their IdP. Users are added as Viewers by default. Once logged in, the Admin can change the role type of the user to Author or SME. To invite Authors or SMEs using the New User Wizard, the Admin can add users in MadCap central and an email will be sent providing the option to log in with new MadCap Central credentials or via their IdP.