So, like many folks here, I have not received any email invitations yet. But my FP+ options became available on Monday, and I was able to customize MB on Tuesday. Today I received an email alert that my Magic Band has shipped via UPS, (with a tracking number). Also today, several other FP+ attractions and shows opened up. Now I get to go back and change a bunch of my FP's.
It's funny that my FP+/MB eligibility begins 3 days into my trip. It's on the day that I switch resorts to AKL. I will also be moving to WL a little later in the trip. Don't know if the MB will work to open the room door at WL, but I am able to reserve FP+ through the remainder of my trip.
When I called Disney about this the other day, the CM told me to print out my FP+ confirmations and bring it with me. She said that even if I turn out to NOT be eligible, I can show it to the front desk CM's at my hotel and they would "take care of it", as a "Guest Service issue". I'm not yet at the 17-day mark for my AKL reservation, so we'll just have to wait and see what develops in the next few days. It seems like a lot is going on now with this whole FP+ thing. I expect a full roll-out in time for the holiday season.