Do you have a history of borrowing accounts and frequently logging in from different places? Borrowing an account may violate the user agreement and result in a temporary account ban. If the person who borrows your account uses illegal procedures, it may result in a permanent ban. It is recommended to go to the official forum to check the account ban list to confirm the reason for the ban. If you have any questions, you can submit a customer service form to appeal. It is best not to lend or leak Blizzard's Battle.net pass, as it is often easily used by criminals to make money.