Organization Act of the National Immigration Agency, Ministry of the Interior Article 5

If necessary, the Agency shall be permitted by Executive YUAN [Republic of China (Taiwan)], and may dispatch staff members to work in the R.O.C. Overseas Missions in pursuance of the Organization Act of Diplomatic Missions of the Republic of China (Taiwan).
中文原文 內政部移民署組織法第5條
本署為應業務需要,得報請行政院核准,派員駐境外辦事,並依駐外機構組織通則規定辦理。

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