Administrative Litigation Act Article 68

Except as otherwise notified by the party or the agent, where an agent of service has been appointed and such appointment has been notified to the court, such appointment shall take effect with regard to the administrative courts of all instances within the same geographic boundaries.
中文原文 行政訴訟法第68條
送達代收人經指定陳明後,其效力及於同地之各級行政法院。
但該當事人或代理人別有陳明者,不在此限。

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