It is assumed that, for security reasons, you need to enable the screen lock function (PIN or pattern) on your Android device at present. Enabling the screen lock function may resolve the account transfer issue. Please follow the steps below to enable the screen lock function on your device, and then log in to the game again to see if it works.
【Enabling the screen lock function】
The steps for enabling the screen lock function may differ depending on the screen of each Android device, so please refer to the following instructions provided by Google.
https://support.google.com/android/answer/9079129?hl=en
If the same issue persists even after enabling the screen lock function, please confirm your Android device settings by following the steps below to see if they resolve the situation.
【Clear Storage in Google Play Services】
*This is 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".
*Please note that "Clear Cache" will not resolve the issue.
④ Tap "Clear all Data".
*“Google Play Store” app also exists in the “app”.
*Please check whether you have performed the operation “Clear all data” for “Google Play Services” in the “app”.
⑤ After 5 minutes have passed, transfer account on the app.
If clearing Google Play Services data does not resolve the issue, we recommend that you contact Google Play customer support. This is because the “sign-in block” that is occurring on your device is judged and implemented by Google Play.