I filed an extension but the money was not withdrawn from my bank account

[bluedeb · Accepted solution]

if you filed right before (or on) the busy April 15, 2019 deadline, the IRS may not be able to debit your payment until after the deadline, due to high e-filing volume. In addition, it can take your bank another few days to post the debit to your account.

When will my tax payment go through?

https://ttlc.intuit.com/replies/3299924