Hello @Casares30k ,Welcome to forums!
According to Epic’s official page “How does XP calibration work in Fortnite Creative?”, each island goes through a calibration process to determine how much XP it can grant through the Accolades devices.
Even if the map shows the XP icon, the system can limit or adjust the actual amount based on usage data, player activity, and frequency. That might be why it’s currently not granting XP.
I also found other posts mentioning the same issue you’re having
You could try opening a support ticket on Epic’s website; they might be able to help you solve it more directly.