If you are a US citizen you will file using form 1040. In the "My Info" section you will select that you lived in "Foreign/US possession" on 31 Dec and "No" you did not live in any other state in 2020.
Then, if MA withheld taxes on your W2, you will need to file non-resident MA return to get that refunded. In the "My Info" section scroll down to "Other State Income" and select MA. This will generate the MA non-resident return.
If however, you are not a US citizen, but hold an alien immigration status then you did not meet the substantial presence test for Resident alien status and would file using a form 1040NR. TurboTax does not support that form, however Sprintax can provide any assistance you might need for that form.
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