Hello,
This article should help you if you've filed for an extension through TurboTax: https://ttlc.intuit.com/community/tax-payments/help/how-do-i-get-credit-for-tax-payments-i-made-with-my-extension/00/26817
IRS extensions for tax year 2019 must be filed on or before July 15, 2020 for domestic taxpayers. (At this time, we're still awaiting guidance for U.S. citizens or resident aliens who will be out of the country on July 15.) It isn't possible to file a post-deadline extension.
Keep in mind: An extension doesn't give you extra time to pay your taxes — but it will keep you from getting a late filing penalty. (You'll still owe interest if you pay after the deadline).
Note: If you're paying additional taxes owed with direct debit, you'll need to provide your 2018 AGI for verification purposes (if you didn't file a 2018 return, enter 0 as your AGI).
If you don't have your AGI, or your extension gets rejected for the wrong AGI, here are 2 options:
If you filed prior to the deadline, but were rejected, you have until July 20 to mail in your extension.