Board Thread:Love Live! School Idol Festival Lounge/@comment-11148831-20160518151457/@comment-11148831-20170408130131

They are saying that since the account is still "active" (you getting your login bonuses counts as logging in), they will not be able to provide you with a transfer ID and passcode「引き継ぎID/引き継ぎパスワード」, not until they confirm that the person emailing them holds the account.

To confirm it's you, an authentication code「認証コード」will show up on your screen once you open the app. This code will serve as a key to your identification. You will reply to their email with the authentication code that showed up on your screen.

NOTE: The authentication code will no longer show up once you close the app for the first time that you see it.