Key from NPC

I want an NPC to give the PC a key. However, whenever I try to make it give me a key with the world ID “fork” (which is the ID for my world), nothing happens. Then I use the exact same string except for the different key name:
player.receiveitem(“base_key_03”,1);
And I get the key. Any idea why it’s not working for a key I created?
player.receiveitem(“base_key_03”,1);
And I get the key. Any idea why it’s not working for a key I created?