Unreal Engine 5, HTC Tracker,

Hi all, since months I try to fix this problem: I work with 3 HTC Vive Trackers. When I start simulating the game, only one Vivetracker is active and moves in the simulation. Whats wrong? When I finish the Simulation, all 3 tracker work fine. Can I use the Apple Face tracker without pushing the Simulationbutton? Thanks in advance for your help. Best D.