Fortnite gets PS4-Xbox One crossplay due to configuration issue

Fortnite Mobile UPDATE - PS4 and Xbox One cross-play BOOST, Gaming, Entertainment

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Sony enabling Fortnite cross-play for PS4 against Xbox and Switch - The Verge

Xbox Head Phil Spencer and Nintendo President Comment on Sony's PS4 Fortnite Crossplay Stance

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On Fortnite Xbox you can't play Fortnite without Xbox Live Gold now I can't play with my Xbox friend (I'm on PS4) P.S The photo is from a video : r/FortNiteBR

Fortnite Cross-Platform Play Accidentally Activates Again