Got to step 8 yesterday as well. Same "no appointments for delivery available" for me, however, I haven't received any additonal information, like the text you received. I set an appointment to talk to my Guide tomorrow morning, as CS said I'd need to speak with them.
Also, carrier delivery...
Just trying to give you another data point here, that I agree with you (please don't kill this lucky messenger when you read on ...)
Popping over from the Oct-Dec estimated delivery group, also with a September 21 order. I'm on 8 steps which opened 2 days ago after the following scenario...