diff --git a/internal/service/highwin/admin.go b/internal/service/highwin/admin.go
index 8c25253..8ffaac4 100644
--- a/internal/service/highwin/admin.go
+++ b/internal/service/highwin/admin.go
@@ -122,6 +122,11 @@ func (w *BroadcastSimulationWorker) Start(ctx context.Context, req ContinuousSim
 	if w == nil || w.db == nil || w.redis == nil || w.broadcaster == nil {
 		return nil, common.NewAppError(http.StatusInternalServerError, "simulation_worker_not_configured", "simulation worker is not configured")
 	}
+	normalizedRegionCodes, err := w.normalizeConfiguredRegionCodes(ctx, req.SysOrigin, req.RegionCodes)
+	if err != nil {
+		return nil, err
+	}
+	req.RegionCodes = normalizedRegionCodes
 
 	w.mu.Lock()
 	if w.cancel != nil {
@@ -332,6 +337,63 @@ func (w *BroadcastSimulationWorker) sendContinuous(ctx context.Context, req Broa
 	return err
 }
 
+func (w *BroadcastSimulationWorker) normalizeConfiguredRegionCodes(ctx context.Context, sysOrigin string, values []string) ([]string, error) {
+	var rows []struct {
+		ID         int64
+		RegionCode string
+		RegionName string
+	}
+	if err := w.db.WithContext(ctx).
+		Table("voice_room_region_im_group").
+		Select("id, region_code, region_name").
+		Where("sys_origin = ? AND status = ? AND group_id <> ?", sysOrigin, "ACTIVE", "").
+		Find(&rows).Error; err != nil {
+		return nil, err
+	}
+	lookup := map[string]string{}
+	for _, row := range rows {
+		code := strings.TrimSpace(row.RegionCode)
+		if code == "" {
+			continue
+		}
+		for _, key := range []string{
+			code,
+			row.RegionName,
+			strconv.FormatInt(row.ID, 10),
+		} {
+			key = strings.ToUpper(strings.TrimSpace(key))
+			if key != "" {
+				lookup[key] = code
+			}
+		}
+	}
+	seen := map[string]struct{}{}
+	result := make([]string, 0, len(values))
+	for _, value := range values {
+		raw := strings.TrimSpace(value)
+		code := lookup[strings.ToUpper(raw)]
+		if code == "" {
+			code = raw
+		}
+		if _, ok := lookup[strings.ToUpper(code)]; !ok {
+			continue
+		}
+		key := strings.ToUpper(strings.TrimSpace(code))
+		if key == "" {
+			continue
+		}
+		if _, exists := seen[key]; exists {
+			continue
+		}
+		seen[key] = struct{}{}
+		result = append(result, code)
+	}
+	if len(result) == 0 {
+		return nil, common.NewAppError(http.StatusBadRequest, "simulation_region_im_group_missing", "selected regions have no active region im group")
+	}
+	return result, nil
+}
+
 func (w *BroadcastSimulationWorker) randomOfflineUser(ctx context.Context, sysOrigin string, rng *rand.Rand) (int64, error) {
 	onlineIDs := w.onlineUserIDs(ctx, sysOrigin)
 	query := w.db.WithContext(ctx).