TurboTax does not support the Form 390 American Samoa tax return.
https://turbotax.intuit.com/tax-tips/military/filing-irs-form-1116-to-claim-the-foreign-tax-credit/L2ODfqp89
https://ttlc.intuit.com/community/state-taxes/discussion/what-exactly-am-i-supposed-to-fill-in-for-az-form-309/00/461059