diff --git a/Assets/AppCenter/Editor/CreateManifest.cs b/Assets/AppCenter/Editor/CreateManifest.cs
index 3de65675..153991b7 100644
--- a/Assets/AppCenter/Editor/CreateManifest.cs
+++ b/Assets/AppCenter/Editor/CreateManifest.cs
@@ -143,14 +143,8 @@ public class CreateManifest
             Directory.Delete(loaderFolder, true);
             return;
         }
-        var activityElements = applicationElements[0].Elements().Where(element => element.Name.LocalName == "activity").ToList();
-
-        // Delete the unzipped folder if the activity element already exists in the AndroidManifest.xml file
-        if (activityElements.Count == 1)
-        {
-            Directory.Delete(loaderFolder, true);
-            return;
-        }
+        var activityElementOld = applicationElements[0].Elements().FirstOrDefault(element => element.Name.LocalName == "activity");
+       
 
         var intentElement = new XElement("intent-filter");
         XNamespace ns = "http://schemas.android.com/apk/res/android";
@@ -171,7 +165,15 @@ public class CreateManifest
         intentElement.Add(categoryElement2);
         intentElement.Add(dataElement);
         activityElement.Add(intentElement);
-        applicationElements[0].Add(activityElement);
+
+        if (activityElementOld != null)
+        {
+            activityElementOld.ReplaceWith(activityElement);
+        }
+        else
+        {
+            applicationElements[0].Add(activityElement);
+        }
         xmlFile.Save(manifestPath);
 
         // Delete the AndroidManifest.xml.meta file if generated
@@ -185,4 +187,4 @@ public class CreateManifest
         ZipFile(loaderFolder, loaderZipFile);
         Directory.Delete(loaderFolder, true);
     }
-}
+}
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d55b9f9..a545a66b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,10 @@ Updated native SDK versions:
 * **[Fix]** Fix `AppCenterStarter.m` was not included in the first build.
 * **[Fix]** Fix Unity 2019.3 iOS build.
 
+### App Center Auth
+
+* **[Fix]** Fix Auth was incorrectly caching the old app secret in the manifest if it was changed.
+
 ### App Center Crashes
 
 #### Android