New Envoy Information
It is not unheard of for an A3 to be denied boarding. A3's are not untouchable. I agree that it sucks that the company will A1 you to where they need you but then leave you at a disadvantage when trying to come home. That's just how they do it here. I'm not sure why there's any debate, they've been doing this for many years.
Take a little initiative and check in early as you can.