Making Portals

@Blublok ... I am assuming the Player (P) is coming in contact with a Collider (C) of some kind and is then instantly teleported to Destination (D).

Here is my code (written for 3D but you can easily change it to 2D)...

 using UnityEngine;
 using System.Collections;
 
 public class Teleport : MonoBehaviour {
 
     public Transform Destination;       // Gameobject where they will be teleported to
     public string TagList = "|Player|Boss|Friendly|"; // List of all tags that can teleport
 
     // Use this for initialization
     void Start () {
         // As needed
     }
     
     // Update is called once per frame
     void Update () {
         // As needed
     }
 
     public void OnTriggerEnter(Collider other)
     {
         // If the tag of the colliding object is allowed to teleport
         if (TagList.Contains(string.Format("|{0}|",other.tag))) {
             // Update other objects position and rotation
             other.transform.position = Destination.transform.position;
             other.transform.rotation = Destination.transform.rotation;
         }
     }
 }

Note that I am checking to see who is allowed to use the teleporter. If you want to allow others through then add their tag names to the list (delimited by pipes |). Also note that the destination is a separate object that needs to be placed away from the collider (and above the ground so the player won't fall through it).

This code is placed on the source teleport object not the destination object. No code needs to be placed on the player or other objects that can use the teleports.

Here is the setup...

Note that the destination of TeleportPad1 is Destination2...

OnCollisionEnter only works for the collider of the GameObject the script is attached to. Judging by the way you're using GameObject.Find I'm guessing that Portals isn't attached to the FPSController which means that the controller's collision isn't triggering the logic to switch places. For it to work you can attach it to your character controller or you could also create a script for each portal that handles it's own collision.