I have decrypted the message but when I enter the info in the submission form it says I'm incorrect. it also looks like I may be missing a character since the output for the solution is only 11 characters instead of 12.
agreed, but I'm not sure why i fully decrypted the rest of the message. the cipher also changes after each submission i have tried it about 10 or so times and still no dice.
Sounds like there is something wrong with the code you are using. In any case, can't really help you without more information. You can PM me to avoid spoilers, if you like.