Maybe...not sure. After a lot of extensive online searching, I came to the conclusion that I need to contact my
travel agent to get a code. Here's what I read:
Please note that DVC members staying on points and their guests and those who book through a travel agent will not receive this email at this time. This is because the email is sent out through Disney Destinations and not directly from Disney's PhotoPass. However, guests who fall under this category are still eligible to pre-purchase the PhotoCD for $99.95 as long as Disney's PhotoPass can verify the reservation information.
DVC Members and those renting points: The DVC owner should be able to contact Member Services to obtain a discount code for use against a future purchase of the PhotoCD.
Travel Agent bookings should have their travel agent contact PhotoPass directly on their behalf to obtain a discount code for use against a future purchase of the PhotoCD.
Staying On Site - Guests who book a Walt Disney World vacation package should receive a special Disney's PhotoPass card included with their documents. Not to be confused with the $99.95 PhotoCD pre-purchase offer, registering this card online will allow Disney's PhotoPass to potentially mail additional offers before, during and after the Disney vacation. A typical offer may be $30-$40 off of the PhotoCD for example. Note that receiving offers is not guaranteed and this is not a substitute for the pre-purchase offer. Guests who are concerned that pre-registering the card may trigger the 30 day deletion clock on all added photos can simply acquire new cards on site to use, however Disney's PhotoPass has advised that the deletion clock only begins once the photos are actually viewed online, not when the card itself is added to the account.

This was helpful to me as I reached out to my travel agent, so I figured I'd share in case it is also helpful to you and any others.