In Stranger of Paradise: Final Fantasy Origin, cross-play is only possible within the console family.
Square Enix will release Stranger of Paradise: Final Fantasy Origin RPG developed by Team Ninja later this month for Xbox Series X|S, Xbox One, PlayStation 4|5 and PC.
If you want to play the game with a friend beyond your own platform, you should know: Stranger of Paradise: Final Fantasy Origin only supports cross-play within the console family. The developer said so Wccftech famous.
So that means players on Xbox One, for example, can only play with other players on Xbox One or Xbox Series X|S. But not with someone on Playstation 5.
Just last week, Square Enix released another demo of Stranger of Paradise: Final Fantasy Origin. A link to the demo and 40 minutes of gameplay can be found in this message.