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.