Unfortunately, I have found that the practice I described on the Joy last December was not repeated on the Dawn in April. In your case, I would definitely go to Guest Services and inquire where Sapphire members meet for priority boarding and stand your ground until you get a sensible answer other than join the queue at the back. If you don't get the correct response, ask for a supervisor. You also a have a concierge who is at your service to run interference for you in these matters. I have found that NCL doesn't always practice what they publish as far as Latitude amenities goes, especially with priority boarding at embarkcation. Raising a flag and asking for a supervisor at check-in works wonders in this case.