Crossplay Has Officially Been Added To Rainbow Six Siege! (PC, Stadia & Luna)

Crossplay & Cross-Progression Deployment Map : r/Rainbow6

It is now possible to queue for Crossplay Multiplayer Quick Match : r/Rainbow6

Rainbow Six Siege Operation Solar Raid Adds Console Crossplay, Cross-Progression, New Map and More

Tom Clancy's Rainbow Six Extraction Cross Platform

So Rainbow 6 Siege launched on luna and it has crossplay with PC

Rainbow Six Siege Cross-play for Playstation 5 and Xbox Series X Being Discussed - COGconnected

Rainbow Six Siege to get crossplay and cross-progression

NEW* Console Can Play With Pc Players! Cross-platform Matchmaking - Rainbow Six Siege

How to Enable Cross Play - Tom Clancy's Rainbow Six Extraction Guide - IGN

Rainbow Six Siege's console crossplay and cross-progression arrive