Anything on line 38? And Does the $408 show on line 1040 line 31 which comes from schedule 3 line 10? If not you still need to enter it. If it is on line 31 then you owe the full 497 in addition to the 408 you already paid.
To enter the amount you paid with an extension (including state extension) go to
Federal Taxes (or Personal for desktop H&B version)
Deductions and Credits
Then scroll way down to Estimates and Other Taxes Paid
Other Income Taxes - Click the Start or Update button
Next page second section Payments with Extension
Either Visit All or Click Start or Update by the extension you paid
