You can obtain user accounts from external sources so that you can use them in your vRealize Operations Manager instance.
There are two types of external user identity sources:
Lightweight Directory Access Protocol (LDAP): Use the LDAP source if you want to use the Active Directory or LDAP servers as authentication sources. The LDAP source does not support multi-domains even when there is a two-way trust between Domain A and Domain B.
Single Sign-On (SSO): Use a single sign-on source to perform single sign-on with any application that supports vCenter single sign-on, including vRealize Operations Manager. For example, you can install a standalone vCenter Platform Services Controller (PSC) and use it to communicate with an Active Directory server. Use a PSC if the Active Directory has a setup that is too complex for the simple LDAP source in vRealize Operations Manager, or if the LDAP source is experiencing slow performance. If your PSC is configured to use Active Directory with integrated Windows authentication mode, SSO users can log in using Windows authentication.