Originally Posted by
gengar
There's nothing in the passport to show membership in the e-Gate reciprocity program. You need to tell the check-in agent that you are an e-Gate program member or of course they're going to search through your passport for the entry stamp. IME the check-in agents can now verify your entry record at the check-in desk so there should be no further issues.
This is the stamp on the last page of my Australian passport showing I've been enrolled in the e-Gate program (I have no Global Entry enrolment).
If Taiwan NIA stamps Australian passports but not US passports, I can see this is going to make check-in GAs' heads spin.