diff --git a/src/Core.Scripts/src/Components/Dialog/FluentDialog.ts b/src/Core.Scripts/src/Components/Dialog/FluentDialog.ts
index 56175ff427..b5f6010172 100644
--- a/src/Core.Scripts/src/Components/Dialog/FluentDialog.ts
+++ b/src/Core.Scripts/src/Components/Dialog/FluentDialog.ts
@@ -1,14 +1,5 @@
 export namespace Microsoft.FluentUI.Blazor.Components.Dialog {
 
-  const getDeepActiveElement = (): HTMLElement | null => {
-    let activeElement: Element | null = document.activeElement;
-    while (activeElement instanceof HTMLElement && activeElement.shadowRoot?.activeElement) {
-      activeElement = activeElement.shadowRoot.activeElement;
-    }
-
-    return activeElement instanceof HTMLElement ? activeElement : null;
-  };
-
   /**
    * Tag names of non-modal, transient elements (e.g. toasts) that reuse the
    * dialog toggle plumbing but must never restore focus when they open or close.
@@ -112,11 +103,16 @@ export namespace Microsoft.FluentUI.Blazor.Components.Dialog {
       return false;
     }
 
-    const activeElement = getDeepActiveElement();
-    if (!activeElement || !dialog.contains(activeElement)) {
+    const activeElement = document.activeElement;
+    if (!(activeElement instanceof HTMLElement) || !dialog.contains(activeElement)) {
       return false;
     }
 
+    // The dialog surface itself receives focus when no interactive content does (e.g. MessageBox).
+    if (activeElement === dialog) {
+      return true;
+    }
+
     // Keep shortcuts active for explicit dialog action surfaces.
     return !!activeElement.closest('[slot="action"], [slot="footer"], [slot="close"], [slot="title-action"]');
   }
diff --git a/tests/Core/Components/Dialog/FluentMessageBoxTests.razor b/tests/Core/Components/Dialog/FluentMessageBoxTests.razor
index 9d346f6e82..6a41edfdae 100644
--- a/tests/Core/Components/Dialog/FluentMessageBoxTests.razor
+++ b/tests/Core/Components/Dialog/FluentMessageBoxTests.razor
@@ -8,6 +8,7 @@
     public FluentMessageBoxTests()
     {
         JSInterop.Mode = JSRuntimeMode.Loose;
+        JSInterop.Setup<bool>("Microsoft.FluentUI.Blazor.Components.Dialog.ShouldHandleShortcut", _ => true).SetResult(true);
         Services.AddFluentUIComponents(options => options.UseGlobalOverlay = false);
 
         DialogService = Services.GetRequiredService<IDialogService>();
@@ -154,6 +155,22 @@
         DialogProvider.Verify();
     }
 
+    [Theory(Timeout = TEST_TIMEOUT)]
+    [InlineData("Y", false)]
+    [InlineData("N", true)]
+    public async Task ShowConfirmationAsync_ShortcutPressed_ReturnsExpectedResult(string shortcut, bool expectedCancelled)
+    {
+        // Arrange
+        var dialogTask = DialogService.ShowConfirmationAsync("My message");
+
+        // Act
+        DialogProvider.Find("fluent-dialog").KeyDown(shortcut);
+        var result = await dialogTask;
+
+        // Assert
+        Assert.Equal(expectedCancelled, result.Cancelled);
+    }
+
     [Fact(Timeout = TEST_TIMEOUT)]
     public async Task FluentMessageBox_EmptyOptions()
     {