Since Illinois included the bonus income on their state return, you have to amend your 2019 California return to exclude it from California income. You should then get a refund of California taxes paid.
For 2019 amendments, scroll down to Your tax return & documents, select 2019 and then Amend (change) return. From there, you can make your changes. When finished, TurboTax will give you instructions for printing and mailing your amended return as amendments can't be e-filed.
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