Before you go any further---you cannot use TurboTax if you need to file a 1040NR. You need a different version of the software from TT's partner, sprintax.
NON RESIDENT ALIEN
If you are a non-resident alien, your return must be filed on Form 1040NR, which cannot be prepared using TurboTax. You can use TT’s partner, sprintax:
https://www.sprintax.com/non-resident-alien-tax-1040nr-turbotax.html
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