Did it clear?  Mine went through QB on the 16th but as of today has not been taken out of our bank account.  No rejection email yet either.  

I paid our MD withholding for January and February on 4/17 and it should have been withdrawn on 4/18. It's now 4/24 and the money still hasn't been withdrawn. According to QB the payments went through, but when I log into MD Tax Connect it says "Underpaid" for each return that I filed and shows the account balance due as the total amount of all the returns. I contacted QB and after a lengthy conversation they directed me to call the State of MD because they said if I paid it through MD Tax Connect I'd be duplicating the payments. When i try to pay the return in MD Tax Connect I get a warning that I'm trying to make a duplicate return/payment. I've been stuck on hold trying to get through to hopefully get some answers.

The state of Maryland is always taking it's time to either withdraw the money or in case of any refunds to deposit it back.

I am sure you have your confirmation number by the MDTaxconnect.

I think we should just wait. 

In a mean time, I made sure that in my QuickBooks setting it is back to be done electronically through the Intuit for the next tax period's payment.