Since I have no way to know your setup, first you need to enable breakpoint on the state AFTER the trigger2d event (assume it is Add Jump State). To do this, go to the state Add Jump, right-click on it, and "Toggle Breakpoint"
1. Next play the game and get the power-up
2. If the play mode pause by itself and redirected you to the Add Jump State, that's mean the trigger works and we could safely say that the trigger works. Therefore, it got to be the script inside the Add Jump State.
3. However, if it doesn't break your game, then we can say that the trigger is not working. Then you could double-check the checkbox if you tick at least one of them as the trigger, Check the size of the box, check the tag on each trigger2d, and make sure it is the same with the trigger 2d action inside your FSM.
Good Luck
PS: don't forget to turn off the breakpoint once you're done with debugging