How Do I fix an issue with My Character Not Jumping?

Hi there, I’m making a 2d game in unity. As far as im aware, i have made my code correctly but My character won’t jump when i click space

This is my code:

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

public class PlayerMovement : MonoBehaviour
{

    public CharacterController2D controller;

    public float runSpeed = 1000f;

    float horizontalMove = 0f;
    bool Jump = false;
    bool Crouch = false;

    // Update is called once per frame
    void Update()
    {
        horizontalMove = Input.GetAxisRaw("Horizontal") * runSpeed;

        if (Input.GetKeyDown(KeyCode.Space))
        {
            Jump = true;
        }

        if (Input.GetKeyDown(KeyCode.LeftControl))
        {
            Crouch = true;
        } else if (Input.GetKeyUp(KeyCode.LeftControl))
        {
            Crouch = false;
        }
    }

    void FixedUpdate()
    {
    // move the character
    controller.Move(horizontalMove * Time.fixedDeltaTime, Crouch, Jump);
        Jump = false;
    }
}

This is a screenshot of what i have in unity

note: I dont want the character to be able to be controlled in the air so thats why air control is off

Have you checked “ground check” was close with ground? As I read a CharacterController2D, player have to on ground to jumping or not