They key is to make sure your federal tax return is complete, then prepare the tax return for your home state--Delaware--last. It doesn't matter which of the other two states you prepare first, but it might be easiest to to the Arizona return first.
It's important to do your resident state return last so you can claim the tax credit for taxes paid to other states on that return. Until you prepare your nonresident state returns, TurboTax cannot claim that credit for you.
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