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Can PC and PS4 play Tom Clancy's Rainbow Six Siege together?
No, crossplay is not yet possible. But Ubisoft has announced that it will come soon, I can't say when exactly.
No Crossplay is not yet supported in R6S, in the leaks "ABOUT R L E G E N" the R6S developers about it. Nothing new is known about this yet. But XBox and PS are compatible.
