Please see the following TurboTax FAQ about entering an incorrect bank account number. In your case, it is not incorrect, the bank closed the account but the details of the FAQ still apply.
Per a statement directly in the FAQ "If the info you provided is for a closed or invalid account, the government will mail you a refund check."
Here is the FAQ for more info:
https://ttlc.intuit.com/replies/3302459
