You can not use online TurboTax for a 2019 return. Online preparation and e-filing for 2019 closed permanently in October 2020. The only way to use TT software for a 2019 return is to download the desktop software to a full PC or Mac, prepare it and mail it in. You have to use a computer that meets the system requirements for the CD/download. The software cannot be used on any sort of mobile device.
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