Regulations Governing Application for Approval of Compulsory License of Musical Works and Royalties for Use Thereof Article 5

Where an appointed agent files the application for a compulsory license, a power of attorney or an evidential document for authorization shall be presented. When the agent is changed or discharged, the change or discharge shall not take effect before a written notice of such change or discharge is given to the Copyright Competent Authority.
中文原文 音樂著作強制授權申請許可及使用報酬辦法第5條
委任他人代理申請強制授權之許可者,應檢具委任書或代理權限之證明文件。
代理人變更或解任時,經以書面通知著作權專責機關後,始對著作權專責機關發生效力。

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