diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2fa1d83b2..9a82ae61a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ### Fixes
 
 - Fixed `Iterable.trackPushOpenWithCampaignId` on Android so the `appAlreadyRunning` argument is forwarded to the native SDK instead of always being sent as `false`.
+- `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 958f15691..3a9185774 100644
--- a/ios/RNIterableAPI/ReactIterableAPI.swift
+++ b/ios/RNIterableAPI/ReactIterableAPI.swift
@@ -410,8 +410,16 @@ 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 ca48934da..98dbf238e 100644
--- a/src/__tests__/IterableInApp.test.ts
+++ b/src/__tests__/IterableInApp.test.ts
@@ -328,6 +328,25 @@ 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 = {