Your account security is our number one priority so for games such as Dragon Ball Z Dokkan battle we highly recommend using “Facebook Login” to transfer the the account instead of a “ID & Transfer code” login. You can find out about Facebook transferring here: https://goo.gl/BphkbU
Facebook tends to lock your account when you log in on different location / IP address, We need you to enable two factors authentication, so it will ask a code when we try to login instead of identity confirmation. And thats why we need the recovery codes for that.
Dokkan Note: Make sure your Dokkan account is NOT LINKED to FB if using ID & TRANSFER CODE login. Inversely, make sure they ARE linked if using FB LOGIN.
Also note while you wait for your order to process you may still play on your account.