diff --git a/extensions/feishu/src/bot.ts b/extensions/feishu/src/bot.ts
index c10f3f518..94d16257e 100644
--- a/extensions/feishu/src/bot.ts
+++ b/extensions/feishu/src/bot.ts
@@ -846,65 +846,13 @@ export async function handleFeishuMessage(params: {
 
     const envelopeFrom = isGroup ? `${ctx.chatId}:${ctx.senderOpenId}` : ctx.senderOpenId;
 
-    // If there's a permission error, dispatch a separate notification first
+    // Append permission error notice to the main message body instead of dispatching
+    // a separate agent turn. A separate dispatch caused the bot to reply twice — once
+    // for the permission notification and once for the actual user message (#27372).
     if (permissionErrorForAgent) {
       const grantUrl = permissionErrorForAgent.grantUrl ?? "";
-      const permissionNotifyBody = `[System: The bot encountered a Feishu API permission error. Please inform the user about this issue and provide the permission grant URL for the admin to authorize. Permission grant URL: ${grantUrl}]`;
-
-      const permissionBody = core.channel.reply.formatAgentEnvelope({
-        channel: "Feishu",
-        from: envelopeFrom,
-        timestamp: new Date(),
-        envelope: envelopeOptions,
-        body: permissionNotifyBody,
-      });
-
-      const permissionCtx = core.channel.reply.finalizeInboundContext({
-        Body: permissionBody,
-        BodyForAgent: permissionNotifyBody,
-        RawBody: permissionNotifyBody,
-        CommandBody: permissionNotifyBody,
-        From: feishuFrom,
-        To: feishuTo,
-        SessionKey: route.sessionKey,
-        AccountId: route.accountId,
-        ChatType: isGroup ? "group" : "direct",
-        GroupSubject: isGroup ? ctx.chatId : undefined,
-        SenderName: "system",
-        SenderId: "system",
-        Provider: "feishu" as const,
-        Surface: "feishu" as const,
-        MessageSid: `${ctx.messageId}:permission-error`,
-        Timestamp: Date.now(),
-        WasMentioned: false,
-        CommandAuthorized: commandAuthorized,
-        OriginatingChannel: "feishu" as const,
-        OriginatingTo: feishuTo,
-      });
-
-      const {
-        dispatcher: permDispatcher,
-        replyOptions: permReplyOptions,
-        markDispatchIdle: markPermIdle,
-      } = createFeishuReplyDispatcher({
-        cfg,
-        agentId: route.agentId,
-        runtime: runtime as RuntimeEnv,
-        chatId: ctx.chatId,
-        replyToMessageId: ctx.messageId,
-        accountId: account.accountId,
-      });
-
-      log(`feishu[${account.accountId}]: dispatching permission error notification to agent`);
-
-      await core.channel.reply.dispatchReplyFromConfig({
-        ctx: permissionCtx,
-        cfg,
-        dispatcher: permDispatcher,
-        replyOptions: permReplyOptions,
-      });
-
-      markPermIdle();
+      messageBody += `\n\n[System: The bot encountered a Feishu API permission error. Please inform the user about this issue and provide the permission grant URL for the admin to authorize. Permission grant URL: ${grantUrl}]`;
+      log(`feishu[${account.accountId}]: appending permission error notice to message body`);
     }
 
     const body = core.channel.reply.formatAgentEnvelope({