You must first configure password-based authentication for administrators who authenticate using an external identity store such as Active Directory or LDAP.
Procedure :
Step 1 & 2 : On the Authentication Method tab, click Password Based and choose one of the external identity sources you have already configured. For example, the Active Directory instance that you have created.
Step 3 : Configure any other specific password policy settings that you want for administrators who authenticate using an external identity store.
Step 4 : Click Save.
