PS4 and Switch Fortnite accounts lock each other out, players

Using a Fortnite account that has been used on the PlayStation 4 will keep you from using that account on the Switch, and an account that has been used on the Switch can’t be played on the PlayStation 4.

Fortnite players can finally merge accounts, but it's complicated

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AOLION Bluetooth Controller Adapter for PS4/ PS5

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Fortnite on Switch Players Can't Carry Over PS4 Accounts - IGN

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Dogean Adjustable Mount for Nintendo Switch Joy-Con

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In response to Fortnite accounts locked out of Switch, Sony says