Siebel SSO setup with Azure AD
We have integrated Siebel IP21.9 with Azure SSO and it's working fine for internal users. Below is high level flow:
end user > Azure AD + Azure APp Proxy (headaer based auth) -> Siebel AI (header:username) -> Siebel app 'security adapter' --> LDAP server
The above setup with two Active Dir with Azure AD & LDAP directory works fine, same set of internal users exist in both AD.
Issue is, for external users, will be registered with Azure AD but they will not have their ids in LDAP. So, Azure authentication is happening but it fails when it reaches to Siebel for LDAP auth.