diff --git a/index.js b/index.js
index 2a53e41..7c793ab 100755
--- a/index.js
+++ b/index.js
@@ -463,21 +463,23 @@
         return true;
       }
 
-    } else { // Self-Built App: passive XML reply
-        logger.info("Self-Built App message/event received, processing for passive reply", {
-          from: message.fromUser,
-          appId: appAccount.id,
-        });
-
-        const processingResult = await processInboundMessage({
-          message,
-          streamId: undefined,
-          timestamp,
-          nonce,
-          account: appAccount,
-          config: fullConfig,
-        }).catch(async (err) => {
-          logger.error("WeCom Self-Built App message processing failed", { error: err.message, appId: appAccount.id });
+            // Self-Built App: passive XML reply
+            logger.info("Self-Built App message/event received, processing for passive reply", {
+              from: message.fromUser,
+              appId: appAccount.id,
+            });
+    
+            // Ensure isSelfBuiltAppRequest is set explicitly
+            message.isSelfBuiltAppRequest = true;
+    
+            const processingResult = await processInboundMessage({
+              message,
+              streamId: undefined,
+              timestamp,
+              nonce,
+              account: appAccount,
+              config: fullConfig,
+            }).catch(async (err) => {          logger.error("WeCom Self-Built App message processing failed", { error: err.message, appId: appAccount.id });
           return { passiveReplyXml: webhook.buildPassiveReplyXml(
               message.fromUser,
               appAccount.id,