TurboTax does not generate forms that don't need to be filed. If you don't owe and AMT, the program isn't going to generate Form 6251 to show that you don't owe AMT and don't need to file the form. If you really want to see Form 6251, you can switch to the Desktop software and view Form 6251 in the "Forms" view. If you're interested, see:
How do I switch from TurboTax Online to the TurboTax software?
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