The passport sticker that replaces the ROC symbol with a “Republic of Taiwan” image has been rejected by customs in Macau, Singapore and Hong Kong. However the stickers have been considered valid in most Western countries.
The designer of the stickers said on Facebook that the stickers are not meant to change the cover of the passports; rather, they are "an artistic action opposing the Utopian 'Republic of China' system." He accused the amendments drafted by the Ministry of Foreign Affairs to be unconstitutional.
Currently, Taiwanese officials can enter the UN headquarters for meetings only with diplomatic credentials issued by the United States Department of State. It is said that because of Xi Jin-ping's visit to the US, the UN started to restrict the related rights of Taiwan.
The Bureau of Consular Affairs points out the actions violate the part of the Enforcement Rules of Passports that state, "Other than filling in relevant information and signatures, passport holders are not authorized to make any alterations to the passports."
After showing her ID, Cai was rejected by the UN staff member, saying that the UN does not accept Taiwanese passports and IDs, and she cannot enter. The receptionist further stressed that Taiwan is a part of China, and required Cai to show a Chinese passport or ID.
Custom officers will ignore decorations if the information page or chip and bar code of the passport are not falsified or damaged.