[root@hostname ~]# groups username
id: cannot find name for group ID 1768498755
[root@hostname ~]#

passwd: files sss
group:  files sss

[sssd]
domains = LDAP

[domains/LDAP]
ldap_schema = rfc2307bis
id_provider = ldap
auth_provider = ldap
ldap_uri = ldap://localhost
ldap_search_base = ou=users,o=company
ldap_user_search_base = ou=users,o=company
ldap_group_search_base = ou=groups,o=company
ldap_tls_reqcert = allow
cache_credentials = true
enumerate = true
min_id = 1

nss_base_group          ou=your,o=base

group:          files ldap