diff --git a/src/Adapter/MSTest.Engine/Engine/TestExecutionContext.cs b/src/Adapter/MSTest.Engine/Engine/TestExecutionContext.cs
index 0f064cb973..1e36d5a376 100644
--- a/src/Adapter/MSTest.Engine/Engine/TestExecutionContext.cs
+++ b/src/Adapter/MSTest.Engine/Engine/TestExecutionContext.cs
@@ -55,7 +55,9 @@ public void ReportException(Exception exception, CancellationToken? timeoutCance
             // We want to consider user timeouts as failures if they didn't use our cancellation token
             OperationCanceledException canceledException
                 when canceledException.CancellationToken == _originalCancellationToken || canceledException.CancellationToken == CancellationToken
+#pragma warning disable CS0618 // Type or member is obsolete
                 => new CancelledTestNodeStateProperty(ExceptionFlattener.FlattenOrUnwrap(exception)),
+#pragma warning restore CS0618 // Type or member is obsolete
             OperationCanceledException canceledException when canceledException.CancellationToken == timeoutCancellationToken
                 => new TimeoutTestNodeStateProperty(ExceptionFlattener.FlattenOrUnwrap(exception)),
             AssertFailedException => new FailedTestNodeStateProperty(ExceptionFlattener.FlattenOrUnwrap(exception), exception.Message),
diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/AzureDevOpsReporter.cs b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/AzureDevOpsReporter.cs
index e9399f9899..e9122b9e1c 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/AzureDevOpsReporter.cs
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/AzureDevOpsReporter.cs
@@ -130,7 +130,9 @@ public async Task ConsumeAsync(IDataProducer dataProducer, IData value, Cancella
             case ErrorTestNodeStateProperty error:
                 await WriteExceptionAsync(error.Explanation, error.Exception, cancellationToken).ConfigureAwait(false);
                 break;
+#pragma warning disable CS0618 // Type or member is obsolete
             case CancelledTestNodeStateProperty cancelled:
+#pragma warning restore CS0618 // Type or member is obsolete
                 await WriteExceptionAsync(cancelled.Explanation, cancelled.Exception, cancellationToken).ConfigureAwait(false);
                 break;
             case TimeoutTestNodeStateProperty timeout:
diff --git a/src/Platform/Microsoft.Testing.Extensions.HangDump/HangDumpActivityIndicator.cs b/src/Platform/Microsoft.Testing.Extensions.HangDump/HangDumpActivityIndicator.cs
index 636e6221cd..3ae365c81e 100644
--- a/src/Platform/Microsoft.Testing.Extensions.HangDump/HangDumpActivityIndicator.cs
+++ b/src/Platform/Microsoft.Testing.Extensions.HangDump/HangDumpActivityIndicator.cs
@@ -172,7 +172,9 @@ public async Task ConsumeAsync(IDataProducer dataProducer, IData value, Cancella
 
             _testsCurrentExecutionState.TryAdd(nodeChangedMessage.TestNode.Uid, (nodeChangedMessage.TestNode.DisplayName, typeof(InProgressTestNodeStateProperty), _clock.UtcNow));
         }
+#pragma warning disable CS0618 // Type or member is obsolete
         else if (state is PassedTestNodeStateProperty or ErrorTestNodeStateProperty or CancelledTestNodeStateProperty
+#pragma warning restore CS0618 // Type or member is obsolete
             or FailedTestNodeStateProperty or TimeoutTestNodeStateProperty or SkippedTestNodeStateProperty
             && _testsCurrentExecutionState.TryRemove(nodeChangedMessage.TestNode.Uid, out (string Name, Type Type, DateTimeOffset StartTime) record)
             && _traceLevelEnabled)
diff --git a/src/Platform/Microsoft.Testing.Extensions.MSBuild/MSBuildConsumer.cs b/src/Platform/Microsoft.Testing.Extensions.MSBuild/MSBuildConsumer.cs
index 1fac29da4b..41e8734c8f 100644
--- a/src/Platform/Microsoft.Testing.Extensions.MSBuild/MSBuildConsumer.cs
+++ b/src/Platform/Microsoft.Testing.Extensions.MSBuild/MSBuildConsumer.cs
@@ -125,7 +125,9 @@ await HandleFailuresAsync(
                             cancellationToken).ConfigureAwait(false);
                         break;
 
+#pragma warning disable CS0618 // Type or member is obsolete
                     case CancelledTestNodeStateProperty canceledState:
+#pragma warning restore CS0618 // Type or member is obsolete
                         await HandleFailuresAsync(
                             testNodeStateChanged.TestNode.DisplayName,
                             isCanceled: true,
diff --git a/src/Platform/Microsoft.Testing.Platform/Messages/TestNodeProperties.Categories.cs b/src/Platform/Microsoft.Testing.Platform/Messages/TestNodeProperties.Categories.cs
index 4ad215da6c..757b2862a4 100644
--- a/src/Platform/Microsoft.Testing.Platform/Messages/TestNodeProperties.Categories.cs
+++ b/src/Platform/Microsoft.Testing.Platform/Messages/TestNodeProperties.Categories.cs
@@ -19,7 +19,9 @@ internal static class TestNodePropertiesCategories
             typeof(FailedTestNodeStateProperty),
             typeof(ErrorTestNodeStateProperty),
             typeof(TimeoutTestNodeStateProperty),
+#pragma warning disable CS0618 // Type or member is obsolete
             typeof(CancelledTestNodeStateProperty),
+#pragma warning restore CS0618 // Type or member is obsolete
         ];
 
     public static Type[] WellKnownTestNodeTestRunOutcomeFailedProperties { get; } =
@@ -27,6 +29,8 @@ internal static class TestNodePropertiesCategories
             typeof(FailedTestNodeStateProperty),
             typeof(ErrorTestNodeStateProperty),
             typeof(TimeoutTestNodeStateProperty),
+#pragma warning disable CS0618 // Type or member is obsolete
             typeof(CancelledTestNodeStateProperty),
+#pragma warning restore CS0618 // Type or member is obsolete
         ];
 }
diff --git a/src/Platform/Microsoft.Testing.Platform/Messages/TestNodeProperties.cs b/src/Platform/Microsoft.Testing.Platform/Messages/TestNodeProperties.cs
index 1e3d4e1957..d05881112e 100644
--- a/src/Platform/Microsoft.Testing.Platform/Messages/TestNodeProperties.cs
+++ b/src/Platform/Microsoft.Testing.Platform/Messages/TestNodeProperties.cs
@@ -437,6 +437,7 @@ public override int GetHashCode()
 /// <summary>
 /// Property that represents an eventual cancellation of a test node.
 /// </summary>
+[Obsolete("CancelledTestNodeStateProperty is obsolete. Test frameworks should throw OperationCanceledException using the cancellation token passed by Microsoft.Testing.Platform instead of using this state.")]
 public sealed class CancelledTestNodeStateProperty : TestNodeStateProperty, IEquatable<CancelledTestNodeStateProperty>
 {
     /// <summary>
diff --git a/src/Platform/Microsoft.Testing.Platform/OutputDevice/BrowserOutputDevice.cs b/src/Platform/Microsoft.Testing.Platform/OutputDevice/BrowserOutputDevice.cs
index d5f2415442..3b6c01edc6 100644
--- a/src/Platform/Microsoft.Testing.Platform/OutputDevice/BrowserOutputDevice.cs
+++ b/src/Platform/Microsoft.Testing.Platform/OutputDevice/BrowserOutputDevice.cs
@@ -356,7 +356,9 @@ public Task ConsumeAsync(IDataProducer dataProducer, IData value, CancellationTo
                         OnFailedTest(testNodeStateChanged, timeoutState, timeoutState.Exception, duration);
                         break;
 
+#pragma warning disable CS0618 // Type or member is obsolete
                     case CancelledTestNodeStateProperty cancelledState:
+#pragma warning restore CS0618 // Type or member is obsolete
                         OnFailedTest(testNodeStateChanged, cancelledState, cancelledState.Exception, duration);
                         break;
 
diff --git a/src/Platform/Microsoft.Testing.Platform/OutputDevice/TerminalOutputDevice.cs b/src/Platform/Microsoft.Testing.Platform/OutputDevice/TerminalOutputDevice.cs
index e689f41abf..c09ac428fe 100644
--- a/src/Platform/Microsoft.Testing.Platform/OutputDevice/TerminalOutputDevice.cs
+++ b/src/Platform/Microsoft.Testing.Platform/OutputDevice/TerminalOutputDevice.cs
@@ -460,7 +460,9 @@ public Task ConsumeAsync(IDataProducer dataProducer, IData value, CancellationTo
                              standardError);
                         break;
 
+#pragma warning disable CS0618 // Type or member is obsolete
                     case CancelledTestNodeStateProperty cancelledState:
+#pragma warning restore CS0618 // Type or member is obsolete
                         _terminalTestReporter.TestCompleted(
                              testNodeStateChanged.TestNode.Uid.Value,
                              testNodeStateChanged.TestNode.DisplayName,
diff --git a/src/Platform/Microsoft.Testing.Platform/ServerMode/DotnetTest/IPC/DotnetTestDataConsumer.cs b/src/Platform/Microsoft.Testing.Platform/ServerMode/DotnetTest/IPC/DotnetTestDataConsumer.cs
index 48cbb723f0..7ad8457c07 100644
--- a/src/Platform/Microsoft.Testing.Platform/ServerMode/DotnetTest/IPC/DotnetTestDataConsumer.cs
+++ b/src/Platform/Microsoft.Testing.Platform/ServerMode/DotnetTest/IPC/DotnetTestDataConsumer.cs
@@ -241,7 +241,9 @@ public async Task ConsumeAsync(IDataProducer dataProducer, IData value, Cancella
                 exceptions = FlattenToExceptionMessages(reason, timeoutTestNodeStateProperty.Exception);
                 break;
 
+#pragma warning disable CS0618 // Type or member is obsolete
             case CancelledTestNodeStateProperty cancelledTestNodeStateProperty:
+#pragma warning restore CS0618 // Type or member is obsolete
                 state = TestStates.Cancelled;
                 duration = testNodeUpdateMessage.TestNode.Properties.SingleOrDefault<TimingProperty>()?.GlobalTiming.Duration.Ticks;
                 reason = nodeState.Explanation;
diff --git a/src/Platform/Microsoft.Testing.Platform/ServerMode/JsonRpc/Json/Json.cs b/src/Platform/Microsoft.Testing.Platform/ServerMode/JsonRpc/Json/Json.cs
index e2597d52b6..fe4e396cbb 100644
--- a/src/Platform/Microsoft.Testing.Platform/ServerMode/JsonRpc/Json/Json.cs
+++ b/src/Platform/Microsoft.Testing.Platform/ServerMode/JsonRpc/Json/Json.cs
@@ -248,7 +248,9 @@ public Json(Dictionary<Type, JsonSerializer>? serializers = null, Dictionary<Typ
                                 break;
                             }
 
+#pragma warning disable CS0618 // Type or member is obsolete
                         case CancelledTestNodeStateProperty canceledTestNodeStateProperty:
+#pragma warning restore CS0618 // Type or member is obsolete
                             {
                                 properties.Add(("execution-state", "canceled"));
                                 Exception? exception = canceledTestNodeStateProperty.Exception;
diff --git a/src/Platform/Microsoft.Testing.Platform/ServerMode/JsonRpc/PerRequestServerDataConsumerService.cs b/src/Platform/Microsoft.Testing.Platform/ServerMode/JsonRpc/PerRequestServerDataConsumerService.cs
index 18ff2ad571..f95942b512 100644
--- a/src/Platform/Microsoft.Testing.Platform/ServerMode/JsonRpc/PerRequestServerDataConsumerService.cs
+++ b/src/Platform/Microsoft.Testing.Platform/ServerMode/JsonRpc/PerRequestServerDataConsumerService.cs
@@ -256,7 +256,9 @@ internal void PopulateTestNodeStatistics(TestNodeUpdateMessage message)
 
             case FailedTestNodeStateProperty:
             case ErrorTestNodeStateProperty:
+#pragma warning disable CS0618 // Type or member is obsolete
             case CancelledTestNodeStateProperty:
+#pragma warning restore CS0618 // Type or member is obsolete
             case TimeoutTestNodeStateProperty:
                 AddOrUpdateTestNodeStateStatistics(testNodeUid, hasPassed: false);
                 break;
diff --git a/src/Platform/Microsoft.Testing.Platform/ServerMode/JsonRpc/SerializerUtilities.cs b/src/Platform/Microsoft.Testing.Platform/ServerMode/JsonRpc/SerializerUtilities.cs
index 4454b98ba9..7c16ce0d93 100644
--- a/src/Platform/Microsoft.Testing.Platform/ServerMode/JsonRpc/SerializerUtilities.cs
+++ b/src/Platform/Microsoft.Testing.Platform/ServerMode/JsonRpc/SerializerUtilities.cs
@@ -317,7 +317,9 @@ static SerializerUtilities()
                                     break;
                                 }
 
+#pragma warning disable CS0618 // Type or member is obsolete
                             case CancelledTestNodeStateProperty canceledTestNodeStateProperty:
+#pragma warning restore CS0618 // Type or member is obsolete
                                 {
                                     properties["execution-state"] = "canceled";
                                     properties["error.message"] = canceledTestNodeStateProperty.Explanation ?? canceledTestNodeStateProperty.Exception?.Message;
diff --git a/test/UnitTests/Microsoft.Testing.Platform.UnitTests/Services/TestApplicationResultTests.cs b/test/UnitTests/Microsoft.Testing.Platform.UnitTests/Services/TestApplicationResultTests.cs
index c1ed3b1e8b..9613706881 100644
--- a/test/UnitTests/Microsoft.Testing.Platform.UnitTests/Services/TestApplicationResultTests.cs
+++ b/test/UnitTests/Microsoft.Testing.Platform.UnitTests/Services/TestApplicationResultTests.cs
@@ -216,7 +216,9 @@ internal static IEnumerable<object[]> FailedState()
     {
         yield return [new FailedTestNodeStateProperty()];
         yield return [new ErrorTestNodeStateProperty()];
+#pragma warning disable CS0618 // Type or member is obsolete
         yield return [new CancelledTestNodeStateProperty()];
+#pragma warning restore CS0618 // Type or member is obsolete
         yield return [new TimeoutTestNodeStateProperty()];
     }