Animation created via script does not play

I have created an empty GameObject and assigned it a script:

[MenuItem("Custom workflow/Initialize")]
static void Initialize()
{
    // Place a text mesh on the scene
    var obj = new GameObject("Sample");
    obj.transform.position = new Vector3(0, 0, 0);
    var text = obj.AddComponent<TextMesh>();
    text.text = "Hello world";

    AnimationClip clip1 = CreateAnimationClip();
    AnimatorController sm = CreateSimpleAnimatorController(clip1);

    var animator = obj.AddComponent<Animator>();
    animator.runtimeAnimatorController = sm;
    animator.applyRootMotion = true;
}

In the same file, I have created method CreateAnimationClip:

private static AnimationClip CreateAnimationClip()
{
    var translateX = AnimationCurve.Linear(0.0f, 0.0f, 2.0f, 25.0f);
    var animationClip = new AnimationClip();
    animationClip.SetCurve("", typeof(Transform), "position.x", translateX);

    AssetDatabase.CreateAsset(animationClip, "Assets/procanim.anim");

    return animationClip;
}

And I have also defined CreateSimpleAnimatorController:

private static AnimatorController CreateSimpleAnimatorController(
  Motion motion1 = null, Motion motion2 = null)
{
    // Creates the controller
    var controller = AnimatorController.CreateAnimatorControllerAtPath(
      "Assets/SimpleStateMachineTransitions.controller");

    // Add parameters
    controller.AddParameter("GoToB", AnimatorControllerParameterType.Bool);
    controller.AddParameter("GoToA", AnimatorControllerParameterType.Bool);

    // Add StateMachines
    var rootStateMachine = controller.layers[0].stateMachine;

    // Add States
    var stateA1 = rootStateMachine.AddState("stateA1");
    stateA1.motion = motion1;
    var stateB1 = rootStateMachine.AddState("stateB1");
    stateB1.motion = motion2;

    // Add Transitions
    var transitionAB = stateA1.AddTransition(stateB1);
    transitionAB.AddCondition(AnimatorConditionMode.If, 0, "GoToB");
    transitionAB.duration = 0;

    var transitionBA = stateB1.AddTransition(stateA1);
    transitionBA.AddCondition(AnimatorConditionMode.If, 0, "GoToA");
    transitionBA.duration = 0;

    return controller;
}

The problem

As I invoke the menu item, I get all assets in place. When I hit play, nothing happens. I can see state stateA1 is on, but the animation does not run. If I click on the text object in the scene, this is what I see in the animation window:

I think the problem might be here:

animationClip.SetCurve("", typeof(Transform), "position.x", translateX);

Because when I remove it manually and add it manually using the interface and hit play again, it works.

The issue is that I was using the wrong property name, this fixes it:

animationClip.SetCurve("", typeof(Transform), "localPosition.x", translateX);