It’s curious that the now expired website was called kryptosclue.com, and not something like kryptossubmission.com, or kryptostest.com. I have read that when entering an email address, the website inserted a space at the beginning. Might this be the overlooked clue that the site referred to? Perhaps the first character of the plaintext is to be ignored, and something needs to be appended to the end of it. It could be an E, because of all the Es in the Morse code.
Just a thought.