diff --git a/src/Uno.UI/Generated/3.0.0.0/Microsoft.UI.Xaml.Automation.Peers/RichEditBoxAutomationPeer.cs b/src/Uno.UI/Generated/3.0.0.0/Microsoft.UI.Xaml.Automation.Peers/RichEditBoxAutomationPeer.cs
index fa1f876a7f49..e0d43068fe6e 100644
--- a/src/Uno.UI/Generated/3.0.0.0/Microsoft.UI.Xaml.Automation.Peers/RichEditBoxAutomationPeer.cs
+++ b/src/Uno.UI/Generated/3.0.0.0/Microsoft.UI.Xaml.Automation.Peers/RichEditBoxAutomationPeer.cs
@@ -3,12 +3,12 @@
 #pragma warning disable 114 // new keyword hiding
 namespace Microsoft.UI.Xaml.Automation.Peers
 {
-#if __ANDROID__ || __IOS__ || IS_UNIT_TESTS || __WASM__ || __SKIA__ || __NETSTD_REFERENCE__ || __MACOS__
+#if false
 	[global::Uno.NotImplemented]
 #endif
 	public partial class RichEditBoxAutomationPeer : global::Microsoft.UI.Xaml.Automation.Peers.FrameworkElementAutomationPeer
 	{
-#if __ANDROID__ || __IOS__ || IS_UNIT_TESTS || __WASM__ || __SKIA__ || __NETSTD_REFERENCE__ || __MACOS__
+#if false
 		[global::Uno.NotImplemented("__ANDROID__", "__IOS__", "IS_UNIT_TESTS", "__WASM__", "__SKIA__", "__NETSTD_REFERENCE__", "__MACOS__")]
 		public RichEditBoxAutomationPeer(global::Microsoft.UI.Xaml.Controls.RichEditBox owner) : base(owner)
 		{
diff --git a/src/Uno.UI/UI/Xaml/Automation/Peers/RichEditBoxAutomationPeer.cs b/src/Uno.UI/UI/Xaml/Automation/Peers/RichEditBoxAutomationPeer.cs
new file mode 100644
index 000000000000..91bb9e9e19c6
--- /dev/null
+++ b/src/Uno.UI/UI/Xaml/Automation/Peers/RichEditBoxAutomationPeer.cs
@@ -0,0 +1,32 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License. See LICENSE in the project root for license information.
+// MUX Reference RichEditBoxAutomationPeer_Partial.cpp, tag winui3/release/1.4.2
+using System.Collections.Generic;
+
+namespace Microsoft.UI.Xaml.Automation.Peers;
+
+/// <summary>
+/// Exposes RichEditBox types to Microsoft UI Automation.
+/// </summary>
+public partial class RichEditBoxAutomationPeer : FrameworkElementAutomationPeer
+{
+	public RichEditBoxAutomationPeer(Controls.RichEditBox owner) : base(owner)
+	{
+	}
+
+	protected override string GetClassNameCore() => nameof(Controls.RichEditBox);
+
+	protected override AutomationControlType GetAutomationControlTypeCore()
+		=> AutomationControlType.Edit;
+
+	protected override IEnumerable<AutomationPeer> GetDescribedByCore()
+	{
+		var owner = Owner as Controls.RichEditBox;
+
+		//IFC_RETURN(get_Owner(spOwner.GetAddressOf()));
+
+		//IFC_RETURN(TextBoxPlaceholderTextHelper::SetupPlaceholderTextBlockDescribedBy(spOwner));
+
+		//IFC_RETURN(GetAutomationPeerCollection(UIAXcp::APDescribedByProperty, returnValue));
+	}
+}