enemy and player do not collide

Hello, I want to make my enemy kill my player on collision. Unfortunately I do not see where I am going wrong. please help me if you can! :) many thanks in advance.

player script

 void OnCollisionEnter2D(Collision2D target)
     {
         if(target.gameObject.tag == "Ground" || target.gameObject.tag == "Pipe")
         {
             if (isAlive)
             {
                 isAlive = false;
                 anim.SetTrigger("Bird Died");
                 audioSource.PlayOneShot(diedClip);
                 GameplayController.instance.PlayerDiedShowScore(score);
             }
         }
     }

This work just fine, if my player hits the ground or a pipe he dies. but i try doing this

  if(target.gameObject.tag == "Ground" || target.gameObject.tag == "Pipe" || target.gameObject.tag == "Enemy")

and this does not work, So i also tried adding an else if just for the enemy (because i wasnt sure if i am allowed to write more than a single || in an argument.) - that also did not work

Worth Noting

• I also have my Player Colliding with my enemy in the 2d physics settings.

• The Player and the Enemy are on the
  same sorting layer