The controller shall facilitate the exercise of data subject rights under Articles 15 to 22. In the cases referred to in Article 11(2), the controller shall not refuse to act on the request of the data subject for exercising his or her rights under Articles 15 to 22, unless the controller demonstrates that it is not in a position to identify the data subject.
Chapter III, Section 1, Article 12, Paragraph 2
Regulation's subject matter
Transparent information, communication and modalities for the exercise of the rights of the data subject (Article 12, Section 1, Chapter III)