The notion, if not concept, of ‘Citizen of the World’ can have an ordinary or technical meaning. The truth is that every human person born into this world is necessarily a citizen of this world. However, it is not every person born into this world that is so recognised or issued with a world identity document. In international relations until UNGA 79, a ‘citizen of the world’ is any person that is issued with a ‘World Passport’ by the Switzerland-based World Service Authority, an organisation in Switzerland. The world passport is given to people considered to be stateless (Les apatrides). And true enough, people that already possess a national passport of any country and still want the world passport, can also be given. The world passport serves as an identity as a citizen of the world.

https://www.thisdaylive.com/index.php/2024/10/13/from-citizen-of-the-world-to-global-citizen/