There are no PV - Pool/Garden 2 bedrooms that will give you a view of IllumiNations from your balcony. The good news is that you will be only a few steps away from the Boardwalk and you can get a good view there - as good a view as you can get without standing around the World Showcase Lagoon.
Some (not all) standard view rooms and all of the PV-Boardwalk view rooms have a view of the higher level fireworks from IllumiNations from the balcony. both of these room types are separate booking categories for DVC members staying on points - you can't get them with a request.
The Boardwalk view rooms are reserved for members who pay for there stay with points. It is possible for a cash (CRO booked) guest to be assigned to a standard view room, but it is not common. DVC members almost always book those rooms early in the booking window - they cost less points than the preferred views.
Sounds like you are a DVC member. If you want either a standard view or a PV - BW view, call MS back and see if any of those room types are available for your dates. If so, you can change your reservation.
Best wishes -