Set user directories in Jira Software Data Center, this path:
User management > User Directories > Directory Type: LDAP >
Configure LDAP User Directory > Directory Type: OpenLDAP > LDAP Permissions > Default Group Memberships: jira-software-users
After sync the users from LDAP server, they aren't been set into 'jira-software-users' group, so they can't be used.
Why and how to config it correctly?

