Act Governing Relations with Hong Kong and Macau Article 39

Unapproved juridical persons, organizations, or institutions from Hong Kong or Macau can not commit juristic acts in the Taiwan Area.
中文原文 香港澳門關係條例第39條
未經許可之香港或澳門法人、團體或其他機構,不得在臺灣地區為法律行為。

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