A new rule has been implemented: Multiple accounts on the site are prohibited.

In-game you can have several accounts and open multiple windows for mules, duel characters, etc. However, on the site, you must set one main account and link the others in your account settings.

All data and balances (except tokens) will be unified in your main account, and you'll have access to all items and characters from your linked accounts normally.

See in the video below how to link accounts:

Special cases such as LAN houses and shared computers should open a support ticket for review.