Hi Henrique,
In SimBrief, create plan, note username and Pilot ID from plan, save plan and create OFP.
In FBW Flypad Settings(Cogwheel)\ATSU/AOC\Simbrief Username, enter the Simbrief Username.
In MCDU\MCDU MENU\OPTIONS\AOC\SIMBRIEF enter Username. The system should replace this with Simbrief Pilot ID in blue.
Please let us know how you get on.
Cheers
Ian