There are not enough facts to understand your situation, but I can make a guess.
You are a W-2 worker, and you entered a home office deduction. Turbotax will not put form 8829 on your federal return, because the home office deduction is not allowed for W-2 workers on federal taxes. But, you live in a state that does allow the deduction on your state tax return. As a result, you claimed the deduction on your state's version of the itemized deduction form, but turbotax did not include a copy of the federal form 8829 because it didn't prepare one.
Because you don't give enough details, we can't really help you solve this. But since this is an issue with the program function (not including the correct info on the state return) I recommend you call customer support and ask for program help with your state return.
Depending on which version of Turbotax you are using, you might also be able to force it to print a form 8829, or you might be able to find a worksheet that you can pull numbers from to fill out your own 8829 by hand (copying the numbers from the Turbotax worksheet).
But I would start by calling support.
