You will need to Amend your Form 1040 and file a Form 1040NR. You will have to wait until the IRS either accepts or rejects it. If they reject your return, you can just leave it and use Sprintax to file a 1040NR. But if they accept the return you filed using TurboTax, you will have to wait until they have processed and provided you the refund and then amend that return to a 1040NR (or 1040NR-EZ).
Since TurboTax does not support Form 1040NR, you can prepare the return using Sprinttax. Sprintax produces your non-resident tax return, including IRS tax forms 1040NR, 1040NR-EZ, 8843, and W-7 ITIN application depending on your personal needs. Go here https://www.sprintax.com/non-resident-alien-tax-1040nr-turbotax.html
Please review the link below for additional helpful information.
Does TurboTax handle Form 1040-NR for nonresident aliens?
@Minh Nguyen 1
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