I can't use the old zip code (96546) because it was decommissioned by the USPS in September 2019 so all mail going to it is returned to the sender. The new zip was commissioned June 2019 and it has taken some time for many merchants (including Amazon), financial institutions and other entities to update their respective databases. I've properly populated the APO/DPO/FPO information in the personal information section. The TurboTax software error checker is highlighting wherever the zip code (09974) was entered manually or inserted automatically as an invalid zip code. Someone needs to update the TurboTax zip code database.
