Your tags do have "priority" on them and you may just be missing the small FTTF circle. Either way on the Conquest as a platinum guest you will receive all the benefits of FTTF and a few extra that the FTTF guests do not.
Make sure when you check in your luggage with the porter curbside that you point out the priority/fttf status of your tags and they will put orange tape on it to get the luggage delivered to your room faster also. When checking in show your boarding passes and you will be shown to priority check in, once on board your room should also be ready.
I love the platinum benefits of early room access, you can go directly to your room, drop off anything you've carried on and go directly to Lido to get the cruise started without dragging bags with you.