Making a movement function for 2d unity game

Question

So basically im programming a 2d game in unity using c# and i made a movement function as follows:

void PlayerMove(){
    movementX = Input.GetAxisRaw("Horizontal");

    transform.position += new Vector3(movementX, 0f, 0f) * Time.deltaTime * MovementSpeed;

}

then i call it in update() and this worked before but now that i got on my laptop using only the laptop keyboard it wont work, and i dont think its the laptop sending the keys weird or something like that since services like what key am i pressing works. Does anyone know what im doing wrong ive looked through it and im not getting any compiler errors.