diff --git a/internal/service/highwin/admin.go b/internal/service/highwin/admin.go
index 8ffaac4..8c25253 100644
--- a/internal/service/highwin/admin.go
+++ b/internal/service/highwin/admin.go
@@ -122,11 +122,6 @@ 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 {
@@ -337,63 +332,6 @@ 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).