Psyonix has replied to a tweet asking about cross-platform party support to which they replied that it is something Psyonix is working on and hoping to bring later this year. This will allow players across XBox, PC and Switch to join the same party and partake in multiple matches together as opposed to being invited privately every time.
Hey there! We’re actively working on cross-platform party support for a 2018 release. 🙂
— Rocket League Help (@RL_Support) January 21, 2018
Source: RL_Support (Twitter)
This post was written by Mike Scorpio