You cannot use TurboTax for a Form 1040NR. TurboTax does not support 1040NR for a non-resident alien. Did you use TT by mistake or did you use TT's partner---sprintax--as you were supposed to?
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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