To ensure a smooth transition, your previous balance has been automatically converted into a single order with the same amount of FC 24 coins. In 15 days after the update, a pop-up window will appear to guide you confirm the conversion. Don't miss out. The pop-up will show like below, please click "Confirm", it will generate one order for each platform, and then you can click "Get Coins" to get coins to game account as usual.