If this occurs when linking/transferring to a Google Account, either of the following steps (1) to (3) may resolve the issue.
When linking/transferring to a Google Account on an Android device, please make sure that at least one Google Account has been set up from "Settings" app > "Password & accounts" > "Accounts" on your device.
(1) Change the settings for Manage your Google Account (for Android device users)
■Steps (function names may differ depending on the version of devices.)
① Open the Settings app on your device, and tap "Google".
② Tap "Manage your Google Account" for the Google account you wish to Link Account.
③ Tap "Security" tab.
④ Tap "Your connections to third-party apps and services".
⑤ Tap the gear icon in the upper right corner of the screen.
⑥Turn ON "Google Account sign-in prompts" in "Sign in with Google" feature settings.
*If it is already ON, please change it to OFF once, and then turn it back ON.
(2) Clear Storage in Google Play Services (for Android device users)
*Please be sure to read the following caution carefully in advance, and perform it at your own risk if you do so.
■ Caution
When you clear Google Play Services data or storage, it may delete some information saved to your device, including transit cards, COVID cards, and virtual payment cards saved to Google Pay.
■ Steps (function names may differ depending on the version of devices.)
① Open the Settings app on your device, and tap "Apps".
② Tap "See all apps", scroll down and tap "Google Play Services".
③ Tap "Storage" > "Manage Space".
Note: "Clear Cache" will not resolve the issue.
④ Tap "Clear all Data".
⑤ After 5 minutes have passed, transfer account on the app.
(3) If Link/Transfer account fails, try again after 24 hours have passed
If you cancel the operation repeatedly, Link Account/Transfer Account function may be disabled for a while (24 hours) due to Google features.
This could be the cause of the error message, so we are sorry for the inconvenience but please wait at least 24 hours before trying Link Account/Transfer Account again.