Well they still haven’t ironed out the process for
DVC members with cash reservations at other resorts. I called immediately at 9 thinking it may be an issue and glad I did, because I was not able to book.
For those in the same boat, MS knew exactly what to do by associating my member number with my cash reservation number. Once they did that on their end, I was able to go back to the main registration page and go through the prompts to get signed up. The confirmation email showed up immediately. Hopefully this helps others in the same situation. Good luck!!