This happened to us. We booked on the first day of general availability on the Costco Travel website, and couldn't find any pair of Deluxe Family Oceanview connecting rooms. We settled for a pair of connecting Verandahs instead. After I saw this thread I went on the Disney site and found several pairs, so called into Costco and switched to one of the pairs, it took around 30 minutes but they were very pleasant to work with while they worked the phones with Disney, and now we have exactly what we were looking for.