https://www.gamespot.com/articles/fallout-76-cross-play-isnt-happening-even-after-so/1100-6462081/

Sony made the big-time announcement recently that it will finally allow cross-play between PlayStation 4 and competing consoles like Xbox One and Nintendo Switch. Cross-play support is currently live, but only for one game: Fortnite.

In its statement announcing cross-play, Sony said cross-play support for Fortnite is just the start of the company's wider plans. This has led to discussion and speculation about what other games may support cross-play. Bethesda's Fallout 76 won't be one of them.