TurboTax does not support form 8621 so you will be unable to delete Form 8621. To fix this problem you will need to go back through your return and see what you answered that might have triggered TurboTax to think you have a passive foreign investment "PFIC". TurboTax is telling you that it cannot handle your return. Here is a link with more information on What IRS Forms are not included in TurboTax. Most likely the question would be in the investment income section.
If you go through these steps and are still having a problem, come back, and
we can see if there is another way we can help you find where the issue is.
