I booked through Orbitz the night before last. Yesterday morning I added my kids through online chat and also asked about the 12 digit code. He told me that Disney hadn't sent it to them yet, and that I should receive an email when it's created.
I went ahead and tried to add the reservation to MDE using the 6 digit hotel reservation code from Orbitz and it worked just fine. I did not have to wait for the 12 digit conf. code. That said, yesterday afternoon I received a Disney Destinations email with the 12 digit code so it didn't take 5 days.
Edited - you should have received two codes from Orbitz, one is the Orbitz code (longer) and one is the Hotel Confirmation code (6 digits). I added the res using the 6 digit code.
I don't have any suggestions re: the res and tickets and naming.