Thank you for this link: https://apps.irs.gov/app/fatcaFfiList/flu.jsf
For ICICI Bank India, when this GIIN value LDLP3A.99999.SL.356 (obtained from above link) is entered in the FEIN field on the 1099-INT, TurboTax Premier 2024 Desktop edition accepts the 1099-INT and "Tools-->Final Review" does not complain. Any other dummy values such as 00-0000000 and 99-9999999 in the FEIN get flagged by TurboTax's Final Review.
