This is gonna sound like a stupid question, but here goes …
When flying to the Taiwanese islands (Green Island, Orchid Island, Penghu, etc), as far as you know, do Taiwanese authorities require foreigners to show their passports or are ARCs sufficient?
Common sense says no, but then you know how that goes. My only indication is that no one asked for any ID at all when I boarded boats to and from two of these islands. Just wondering if the whole airport security chaos requires something different.