When adding Mii characters, if you tap the button on the Nintendo Account website that returns you to the game, you will not be able to add your created Mii characters. If this occurs, restart the game to be able to add Mii characters again.
When adding Mii characters, if you tap the button on the Nintendo Account website that returns you to the game, you will not be able to add your created Mii characters. If this occurs, restart the game to be able to add Mii characters again.