Need Help Getting My Player To Jump.

I added Photon To My Game And Now My Player Wont Jump, Not Sure What Is Causing this issue. I had him jumping after but Something happened and I Had To Re import my player Model and start from scratch, I used all of the same code, and even attached a Rigidbody and Capsule collider to the player and I can not for the life of me figure out why when I hit space that the player won't jump. Maybe someone can steer me in the right direction. Here is all the code involved with making the player jump. I know it's something simple, Just can't figure it out. Dnt even kno if it's something to do with the code.

 [Header("Jump Settings")]
 public Vector3 jump;
 public float jumpForce = 2.0f;
 public float floorAngleThreshhold = 15.0f;
 public bool IsGrounded = false;

 Rigidbody RB;


 private void Start()
 {

     _animator = GetComponent<Animator>();


     RB = GetComponent<Rigidbody>();


     jump = new Vector3(0.0f, 2.0f, 0.0f);
     

     
 }

      private void OnCollisionStay(Collision col)
 {
     foreach (ContactPoint hit in col)
     {
         
         if (Vector3.Angle(Vector3.up, hit.normal) <= floorAngleThreshhold)
         {
             IsGrounded = true;
             return;
         }
     }
 }

 private void OnCollisionExit()
 {
     IsGrounded = false; 
 }

  private void Jump()
 {
     if (IsGrounded)
     {
         if (Input.GetKeyDown(KeyCode.Space) && PlayerStat.StaminaBar.value > 0.3)
         {
             RB.AddForce(jump * jumpForce, ForceMode.Impulse);
             _animator.SetTrigger("IsJumping");
         }
         else
         {
             _animator.SetBool("IsFalling", false);
             _animator.SetBool("Landing", true);
         }
     }
     else
     {
         _animator.SetBool("IsFalling", true);
     }

 }