Why am I not getting Supercharged XP in Fortnite?

Supercharged XP is a temporary catch-up mechanic that activates automatically when you've missed Daily or Weekly quests. It boosts your XP gains until you've made up the XP you missed - once you've caught up, the Supercharge ends.

How to tell if Supercharged XP is active:
Your XP notifications will appear orange instead of purple, and you'll see a lightning bolt icon next to your XP bar.

To get Supercharged XP again:
Skip a day or more of play to accumulate missed quest XP. The boost will reactivate the next time you play.
Epic Games also runs periodic Supercharged XP events that apply the boost server-wide for all players, regardless of missed quests.