Citigroup, Inc. C accidentally credited a client’s account with $81 trillion when it was supposed to credit only $280. This error could delay the bank’s attempt to influence regulators that it has fixed long-standing operational issues.

Citigroup credited a client’s account with $81tn when it meant to send only $280, an error that could hinder the bank’s attempt to persuade regulators that it has fixed long-standing operational issues.

Citigroup credited $81 trillion to a customer’s account, instead of just $280, and took hours to reverse the transaction — an embarrassing “near miss” for a bank that has struggled to fix operational issues.