https://www.siliconvalley.com/2021/01/08/millions-of-stimulus-checks-were-sent-to-wrong-accounts-heres-how-to-check-if-yours-was-one-of-them/

For many Americans who used tax preparation services, the second stimulus payment was sent to an invalid bank account.

H&R Block, Jackson Hewitt and TurboTax have issued statements informing their clients for the 2019 tax year that the payment may have gone to now-closed accounts. The misdirected payments number in the millions, they said.