I've been following the threads on the BOG Lunch FP+ and since I am going mid-May, I was excited to be able to try this. Of course May is not open yet, so I haven't actually tried to make the reservation yet.
I had called the Disney Dining line to change the time on a reservation last week, as my laptop was having an issue. The CM assisted me, and I asked her about the BOG FP. She said "you will definately receive an invitation by email upon your check in." She repeated "definately" a few times.
Then I had to call back over the weekend to add one more meal, as I kept seeing it on the screen, but was getting an error when I tried to reserve. That CM asked me if there was anything else she could help me with, and I told her I was just waiting for times to open up for BOG Lunch. She told me that it was only reserved by invitation, and those were completely random. I told her I had heard that some folks were able to reserve with their confirmation number, and she said that was incorrect.
Either the CMs don't know about this, or they are being told to discourage us from reserving this way. I don't know if I will recieve a invite upon check-in (I wonder if my account was flagged and thats why the first CM said what she did) or even what to think. Its not the end of the world if I don't get to eat there, but I wish I was more sure about the process. I would be REALLY interested to hear from people who were granted access or denied access who had made their reservation without an email invitation.