Enforcement Rules of the Wildlife Conservation Act Article 33-3

Beginning on January 1, 2020, previous trade approval of ivory or their products, issued by municipal or county (city) Authorities according to Article 35, Paragraph 1 of the WCA, will not be allowed to buy or sell. Original trade approval documents will be invalid simultaneously.
中文原文 野生動物保育法施行細則第33-3條
直轄市、縣(市)主管機關依本法第三十五條第一項同意買賣之象牙或象牙加工品,自中華民國一百零九年一月一日起,不得買賣。
原同意買賣文件併同失效。

English translation for reference only; the Chinese text prevails. Not legal advice.