Need Help With Jumping In My Movement Script

Hello, I am new to developing and would like to know why I cannot get my jump to work? The tutorial I followed to get it isn’t much of a help because it goes to fast and I am not getting any errors but when I press the space key to jump as programmed using the input.getkeydown feature it just is not jumping the horizontal movement and looking works tho. Here’s the script so far

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

public class PlayerMovement : MonoBehaviour
{
float playerHeight = 1.5f;
[Header(“Movement”)]
public float moveSpeed = 6f;

[Header("Jumping")]
public float jumpForce = 5f;

[Header("Keybinds")]
[SerializeField] KeyCode jumpKey = KeyCode.Space;

public float movementMultiplier = 10f;
[SerializeField] float airMultiplier = 0.1f;
float groundDrag = 6f;
float airDrag = 2f;

float horizontalMovement;
float verticalMovement;

bool isGrounded;

Vector3 moveDirection;

Rigidbody rb;

private void Start()
{
    rb = GetComponent<Rigidbody>();
    rb.freezeRotation = true;
}

private void Update()
{
isGrounded = Physics.Raycast(transform.position, Vector3.down, playerHeight / 2 + 0.1f);

MyInput();
ControlDrag();

if (Input.GetKeyDown(jumpKey) && isGrounded)
{
Jump();
}

}
void MyInput()
{
horizontalMovement = Input.GetAxisRaw(“Horizontal”);
verticalMovement = Input.GetAxisRaw(“Vertical”);

moveDirection = transform.forward * verticalMovement + transform.right * horizontalMovement;
}
void Jump()
{
rb.AddForce(transform.up * jumpForce, ForceMode.Impulse);
}
void ControlDrag()
{
if(isGrounded)
{
rb.drag = groundDrag;
}
else
{
rb.drag = airDrag;
}
}
private void FixedUpdate()
{
MovePlayer();
}
void MovePlayer()
{
if(isGrounded)
{
rb.AddForce(moveDirection.normalized * moveSpeed * movementMultiplier, ForceMode.Acceleration);
}
else if(! isGrounded)
{
rb.AddForce(moveDirection.normalized * moveSpeed * movementMultiplier * airMultiplier, ForceMode.Acceleration);
}
}

}

I copy pasted your code and it just worked.
My values are:

Editor Version 2022.3.1f1.