【Updated: 】
To continue playing Mario Kart Tour after changing devices, install Mario Kart Tour on your new device and link the Nintendo Account linked to your save data via the Nintendo Account screen in-game.
Notes:
・ Be sure to confirm your Nintendo Account information on your old device before changing to your new device.
・ The same Mario Kart Tour save data can't be accessed on multiple devices at the same time.
・ Rubies that have been acquired or purchased can only be used on the same OS. They will not be usable on devices that use a different OS.