Not every BWV studio and 1 bedroom is a lock off. BWV has 97 Dedicated Studios & 130 Dedicated 1 Bedrooms. I do not know how many of those are in the Boardwalk View category.
If either the studio or 1 bedroom you booked is dedicated, you can't combine them into a 2 bedroom. Your reservation will not show which you currently have as neither of those are booking categories at BWV. MS can tell, though.
FWIW, I wouldn't risk it with a call. I'd email all the details and ask to have them the two reservations merged into one reservation for a 2 bedroom. I'd be very clear that I would rather keep what I had than lose either reservation if they couldn't do it.
Emails are usually worked when the phones aren't busy and IME, by the more experienced CMs. I've not had a problem asking for things this way as long as the need wasn't urgent.
Good luck!