How doees this work if a booking is made via an internal corporate booking company? Surely if one avails of the Ame Platinum benefits and registers with the card provider you are on their platinum programme?

Scenario booking for Sofitel Dubai through corporate booking and holding Amex platinum .
Can you avail of room upgrade or do you need to advise prior to arrival? Assuming there is an Exec club is this only for the platinum holder or holder plus guest? if platinum holder boooked twoo rooms would you get lounge plus guest for wo rooms?