diff --git a/src/Oms.Domain/ChannelsAggregate/Consts/IssueNotifyMethodCodes.cs b/src/Oms.Domain/ChannelsAggregate/Consts/IssueNotifyMethodCodes.cs
index 3d495ec..887cf44 100644
--- a/src/Oms.Domain/ChannelsAggregate/Consts/IssueNotifyMethodCodes.cs
+++ b/src/Oms.Domain/ChannelsAggregate/Consts/IssueNotifyMethodCodes.cs
@@ -8,22 +8,22 @@ public static class IssueNotifyMethodCodes
     public const string Feishu = "feishu";
     public const string Wechat = "wechat";
 
-    public static readonly HashSet<string> All =
-    [
+    public static readonly HashSet<string> All = new(StringComparer.OrdinalIgnoreCase)
+    {
         InApp,
         Email,
         Sms,
         Feishu,
         Wechat
-    ];
+    };
 
     public static string GetDisplayName(string? code) => code?.Trim().ToLowerInvariant() switch
     {
-        InApp => "站内信",
-        Email => "邮件",
-        Sms => "短信",
-        Feishu => "飞书",
-        Wechat => "微信",
+        "inapp" => "站内信",
+        "email" => "邮件",
+        "sms" => "短信",
+        "feishu" => "飞书",
+        "wechat" => "微信",
         _ => code ?? string.Empty
     };
 
@@ -36,8 +36,9 @@ public static class IssueNotifyMethodCodes
 
         var parts = raw
             .Split([',', ';', ' '], StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries)
-            .Select(x => x.ToLowerInvariant())
-            .Where(x => All.Contains(x))
+            .Select(ToCanonical)
+            .Where(x => x != null)
+            .Cast<string>()
             .Distinct(StringComparer.OrdinalIgnoreCase)
             .ToList();
 
@@ -54,4 +55,22 @@ public static class IssueNotifyMethodCodes
 
         return normalized.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries).ToList();
     }
+
+    private static string? ToCanonical(string raw)
+    {
+        if (string.IsNullOrWhiteSpace(raw))
+        {
+            return null;
+        }
+
+        return raw.Trim().ToLowerInvariant() switch
+        {
+            "inapp" => InApp,
+            "email" => Email,
+            "sms" => Sms,
+            "feishu" => Feishu,
+            "wechat" => Wechat,
+            _ => null
+        };
+    }
 }