I also called and simply asked if my code was still valid. The person took a minute or so and said I don't see why not. So similar to you, I got a maybe, which isn't helpful at all. Also submitted a question via the automated form with more specifics about bought tickets with the first shows and now have a different code, is it still valid for the two new shows. As much as I'd like to have a way to confirm if this would cause a violation or not, scalpers would just find a way to abuse it. IIRC, for the JT 2017 when you entered your code it would tell you how many tickets you had left, but maybe it was a dream.