1st Person Character Controller X Axis not working

I can move the camera with my mouse up and down, but not left and right. This is the script I'musing PLS HELP.

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class mouse_look : MonoBehaviour {

 public float mouseSensitivity = 100f;

 public Transform playerBody;

 float xRotation = 0f;

 // Start is called before the first frame update
 void Start()
 {
     Cursor.lockState = CursorLockMode.Locked;
 }

 // Update is called once per frame
 void Update()
 {
     float mouseX = Input.GetAxis("Mouse X") * mouseSensitivity * Time.deltaTime;
     float mouseY = Input.GetAxis("Mouse Y") * mouseSensitivity * Time.deltaTime;

     xRotation -= mouseY;
     xRotation = Mathf.Clamp(xRotation, -90f, 90f);

     transform.localRotation = Quaternion.Euler(xRotation, 0f, 0f);
     playerBody.Rotate(Vector3.up * mouseX);
 }

}