All it takes is a 2K Account.
Civilization 6 cross-save support between Windows PC and Mac via Steam and Nintendo Switch is now available, 2K and Firaxis have confirmed.
“Link your 2K Account, tick the multi-platform cloud save box in options, and you’re good to go,” the game’s official Twitter account detailed.
A 2K Account is obviously required to enable cross-save support; those without one can sign up right here to be able to take advantage of the functionality. Users can use a social media account to sign-up quickly, and can then choose to link the account with Xbox One, PS4, Switch and PC.
Sid Meier’s Civilization 6 is available now on Windows PC and Mac via Steam and Nintendo Switch.
— Civilization VI: Gathering Storm (@CivGame) April 2, 2019