Halo Infinite multiplayer has cross-platform support for PC and Xbox - Polygon

Matt Booty, Microsoft’s head of Xbox Game Studios, said on April 29, 2021, that Halo Infinite will support cross-play and cross-progression among Xbox Series X, Windows PC, and Xbox One when the game launches in the fall of 2021.

Despite a strong launch, 'Halo Infinite' is Struggling to Retain Players : r/pcgaming

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Halo Infinite' live service issues linger, and players are losing interest - The Washington Post