On Steam: Players can matchmake, add friends, and join players from Steam and the Microsoft Store, in our Cross-Network Servers. Players cannot opt out of Crossplay.
On the MS Store and Xbox Series X|S: Players can matchmake, add friends, and join players from all supported networks (Steam and XBL), in our Cross-Network Servers. Players can opt in/out of this feature via the account settings, in which case they will matchmake, add friends and join players only within XBL servers.