The IRS has issued a Quick Alert stating that it has identified a delay in processing direct debits for Form 1040 balance due, Form 1040-X and Form 1040-ES estimated tax payments submitted via Modernized e-File. This issue has now been resolved and payments are being processed.
Taxpayer's accounts will be credited with the original requested payment date. Do not resubmit these payments. If a taxpayer re-submitted any of these payment requests due to the delay, then call 1-888-353-4537 to cancel the additional payment. Cancellation requests must be received no later than 11:59 p.m. Eastern time, at least two business days prior to the scheduled payment date.
The Quick Alert can be read in its entirety here: IRS Quick Alert.