I’m just going off some recent experiences like this one: Cannot get an online banking account if ARC expires in less than a year
Satellite_TV:
It is allowed for citizens to enter Taiwan on a foreign passport. By doing so, they are then bound by the conditions of a tourist. Cannot work, must leave when tourist visa time expires. Lot’s of Taiwan citizens who moved abroad as children enter Taiwan on foreign passports and are not required to do military service. My son has entered on both his Taiwan and foreign passports.
Are we talking about a regular Taiwan citizen with household registration, or a non resident national without household registration?