I have a section 72(t)(2)(H) exception to the 10% tax on IRA distributions. This is not available to claim.

Forms show the 5329 available and the worksheet shows your code for exemption on line S. The form could have autogenerated and be in your return. Do you see it there?  To see your forms:

• In desktop, switch to Forms Mode. 
• For online, see How do I preview my TurboTax Online return before filing?

Reference: IRS 5329