Unfortunately, Sid Meier's Civilization VI does not support cross-play between platforms. Users on the Epic Games Store and Steam can play each other via a new feature added called Unified PC Play. This at least unites the PC platform to be able to fully face off against each other.

Can you play Civilization 6 cross-platform?

There is no cross-play multiplayer between platforms. Cross-platform cloud saves are supported across all versions of the game except for PlayStation 4. Thank you for your answer. I do enjoy the game, and have put many hours into it (since civ iii).

Is Civ 6 cross-platform Mac and PC?

Q: Can Mac and Windows play multiplayer together? A: Steam users can play online multiplayer together when these version are in sync. Crossplay between Mac Steam and the Epic Games Store is not supported.