Rocket League has entered the PlayStation Cross-Play Beta program! Players on PlayStation 4, Nintendo Switch, Xbox One, and Steam can now randomly matchmake with or against each other in all Online match types (i.e. Casual, Competitive, and Extra Modes).
To make sure that Cross-Platform play is enabled (it is by default), head to the “Main Menu,” select “Options” and then make sure the “Cross-Platform Play” box is checked in the “Gameplay” tab. And that’s all there is to it. You are now ready to play against gamers on other platforms across the world!
For more information head here