When your application is using keycloak to authenticate to Microsoft Active Directory LDAP service, You may receive the error “keycloak.models.ModelException: User returned from LDAP has null username!” in the logs and the login fails. You may want to look at this article (https://edwin.baculsoft.com/2019/10/fixing-error-null-username-when-integrating-redhat-single-sign-on-to-active-directory for configuration and initial troubleshooting. There are so many reasons for that, … تابع قراءة Keycloak Returns null username Error