August 2017 - last edited August 2017
September 2017
I'd suggest going into the Trial as a Cactus or Pirate but instead of running the Trial again send your Garlic Drone or Parrot down to the end and through the open doorway to take another shot of the combination at the end and then just make certain that you are entering it properly so that it appears exactly as it does in the room at the end of the Trial.
September 2017
September 2017
Are you certain that you are entering the code correctly?
The room where you enter the combination won't accept even a valid combination if you haven't finished the actual Trial, which is why you can't skip the last Trial and jump straight to fighting the Rainbow Guardian after guessing which one of the two combinations it must be to start the fight. Assuming that you're experiencing a game glitch where the door opened and gave you your code but the game thinks you failed the Trial I would assume that running and successfully finishing the Trial a second time should straighten things out.