If you have already submitted your tax return and it has been accepted by the IRS, then the only way to try to claim the credit is to file an amended return.
You can create the amended return and ask questions along the way if you need further help from the Community here, but if you completed the section and there was no indication of any issues other than TurboTax stating that your credit amount is $0, then an amended return may not give you any different results.
Take a look at the return that you filed to see if you had any tax liability that could be offset by the EV credit. If there is no tax liability, then you would not receive the credit. Look at line 18 of your Form 1040 to see if it is greater than zero. If so, then it may be worth trying to amend your return.
Use the following TurboTax help article to get started:
How do I amend my federal tax return?
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