Administrative Litigation Act Article 40

Each co-party has the right to continue the litigation.Prior to designating a court session, the administrative court shall notify all co-parties to appear.
中文原文 行政訴訟法第40條
共同訴訟人各有續行訴訟之權。
行政法院指定期日者,應通知各共同訴訟人到場。

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