var dnValidator func(*libldap.Conn, string) (string, bool, error) = sys.LDAPConfig.GetValidatedUserDN
	if isGroup {
		dnValidator = sys.LDAPConfig.GetValidatedGroupDN
	}

	// map of normalized DN keys to original keys.
	normalizedDNKeysMap := make(map[string][]string)
	var collectedErrors []error
	for k := range policyMap {
		_, err := ldap.NormalizeDN(k)
		if err != nil {
			// not a valid DN, ignore.