Rocket League has made it possible to create a party of players on different platforms.
After enabling cross-platform multiplayer on all platforms a little over a month ago, Rocket League has now added support for cross-platform parties.
With the release of patch 1.58, available now on all platforms, players are able to invite anyone on their friends list to parties and in-game clubs. All players now have a RocketID, which is platform-agnostic. The new friends list shows friends added on the same platform, as well as those attached to your RocketID.
There's also a section for recent players where you can invite players you recently met to your party.
The new update also brings a new lag compensation option, a curveball mutator, and ends season 9 with new rewards. Check the full thing on the official site.