Hi Carlos,
It seems you are trying to load a flight plan from SimBrief into the Fenix A320, rather than into default MSFS aircraft.
In SimBrief make sure you Generate plan.
In Fenix EFB Settings, SIMBRIEF USERNAME , enter you SimBrief Pilot ID.
In Fenix EFB Fenix, Import or Reimport from SimBrief.
You should have imported the plan you just Generated
Cheers
Ian