Art. 43 SCA from 2019

Art. 43 Declaratory Procedure
1 If there is doubt as to whether a person holds Swiss citizenship, the authority in the canton of which the citizenship has been called into question decides, on request or ex officio.
2 The SEM may also request a decision.
Es besteht kein Anspruch auf Aktualität und Vollständigkeit/Richtigkeit.