CharacterController.move doesn't seem to move me horizontally

The following code is in a script that I'm calling ThirdPersonMovement. All I really want to accomplish is some simple character-controller based movement with a third person camera.

     public float movementSpeed;
 
     private CharacterController controller;
     private Vector3 cameraForward;
     private Vector3 cameraRight;
     private Vector3 DirectonToMove;
     private Transform mainCamTransform;
     
     void Start ()
     {
         controller = gameObject.GetComponent<CharacterController>();
         mainCamTransform = Camera.main.transform;
     
     }
 
     void Update ()
     {
         UpdateDirectionToMove();
         transform.rotation = Quaternion.LookRotation(cameraForward);
         controller.Move(DirectonToMove * movementSpeed * Time.deltaTime);
     }
 
     void UpdateDirectionToMove()
     {
         cameraForward = mainCamTransform.TransformDirection(Vector3.forward);
         cameraForward.y = 0;
         cameraForward = cameraForward.normalized;
 
         cameraRight = mainCamTransform.TransformDirection(Vector3.right);
         cameraRight.y = 0;
         cameraRight = cameraRight.normalized;
 
         DirectonToMove = Input.GetAxis("Horizontal") * cameraRight + Input.GetAxis("Vertical") * cameraForward;
         Debug.Log(DirectonToMove);
     }

I want the player to always be facing forward with respect to the camera's forward-facing direction, and currently this is happening correctly. The issue I am having is that I can't seem to move in a direction I am not facing. If I replace "transform.roation = Quaternion.LookRotation(cameraForward);" with the line "transform.rotation = Quaternion.LookRotation(DirectionToMove);" I can move in any direction I please - but I don't get the rotation I want. Any ideas?