diff --git a/CHANGELOG.md b/CHANGELOG.md
index c0673d32c..093632a2d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@
   - The bridge now displays the message on the main thread, matching `setAutoDisplayPaused` and the iOS SDK. It was calling the native in-app displayer on the React Native native-modules thread, which crashes when the current activity is not a `FragmentActivity` (for example a Jetpack Compose `ComponentActivity`).
   - The promise now rejects when the message id is empty or no longer in the native queue instead of crashing with a `NullPointerException`.
   - Dismissing a message by tapping outside it now resolves the promise with `null` instead of crashing on `url.toString()`.
+- `Iterable.inAppManager.showMessage` now rejects on iOS when the message id is empty or no longer in the native queue, matching Android. Previously the promise never settled.
 
 ### Updates
 
diff --git a/ios/RNIterableAPI/ReactIterableAPI.swift b/ios/RNIterableAPI/ReactIterableAPI.swift
index a216a0e69..639d09c73 100644
--- a/ios/RNIterableAPI/ReactIterableAPI.swift
+++ b/ios/RNIterableAPI/ReactIterableAPI.swift
@@ -384,8 +384,16 @@ import React
     rejecter: RCTPromiseRejectBlock
   ) {
     ITBInfo()
+    guard !messageId.isEmpty else {
+      ITBError("messageId is null or empty")
+      rejecter("", "messageId is null or empty", NSError(domain: "", code: 0, userInfo: nil))
+      return
+    }
     guard let message = IterableAPI.inAppManager.getMessage(withId: messageId) else {
       ITBError("Could not find message with id: \(messageId)")
+      rejecter(
+        "", "Could not find message with id: \(messageId)",
+        NSError(domain: "", code: 0, userInfo: nil))
       return
     }
     IterableAPI.inAppManager.show(message: message, consume: consume) { (url) in
diff --git a/src/__tests__/IterableInApp.test.ts b/src/__tests__/IterableInApp.test.ts
index bddb3f3f9..a1e9472c3 100644
--- a/src/__tests__/IterableInApp.test.ts
+++ b/src/__tests__/IterableInApp.test.ts
@@ -228,6 +228,25 @@ describe('Iterable In App', () => {
       });
   });
 
+  test('showMessage_nativeRejects_propagatesRejectionToJs', async () => {
+    // JS contract only: the native rejection itself is implemented in the iOS and Android bridges
+    // GIVEN an in-app message that is no longer in the native queue
+    const message: IterableInAppMessage = IterableInAppMessage.fromDict({
+      messageId: 'message1',
+      campaignId: 1234,
+      trigger: { type: IterableInAppTriggerType.immediate },
+    });
+    const error = new Error('Could not find message with id: message1');
+
+    // WHEN the native module rejects the call
+    MockRNIterableAPI.showMessage.mockRejectedValueOnce(error);
+
+    // THEN Iterable.inAppManager.showMessage rejects with the native error
+    await expect(
+      Iterable.inAppManager?.showMessage(message, true)
+    ).rejects.toBe(error);
+  });
+
   test('removeMessage_params_methodCalledWithParams', () => {
     // GIVEN an in-app message
     const messageDict = {