Administrative Appeal Act Article 23
When an administrative appeal was filed jointly without electing the representative(s), the agency with jurisdiction of administrative appeal may notify the administrative appellants to elect within a specific period. After the expiration of the specific period and the administrative appellants still not elect, the agency with jurisdiction of administrative appeal might assign the representative(s) by its ex officio.
中文原文 訴願法第23條
共同提起訴願，未選定代表人者，受理訴願機關得限期通知其選定；逾期不選定者，得依職權指定之。