Help please

Client gets notice from IRS (Fed) and voucher from MD state. Fed notice says unable to locate his bank account. Bank details are correct and boxes checked for auto-withdraw (and IRS tried).

Any similar issues? This is different from the processing delay that I have read on the forum where withdrawals delayed past expected date. 

I can get client to pay online. Can I cancel the auto-withdraw in case IRS tries to hit his account again and client double pays?

Thanks for any advice

Nolan