So I’ve created the trigger volume and linked it to the doors but when I play the game and go to set what can trigger the trigger volume, there is no default pawn anywhere. I’ve tried making a separate pawn but that doesn’t seem to be working either. I have tried adjusting the height of the trigger volume just in case that was the problem with the new pawn with no luck. Do I need to have a default pawn? If so, how do I make one?
You can go to Modes -> Basic -> Player Start then get another Player Start like default. Remember use Eject before select your pawn in your scene.
Good Luck 
Sorry about my bad English
That did it, thank you.