@kkarhan @nileane it’s complicated, oversea territories have special rules and might not be part of the european union.
New Caledonia is a territory sui generis, meaning it is doing its own thing but doesn’t have the label “its own country” to the eyes of the EU.

New Caledonia has its own parliament and uses the polinesian franc, not the Euro.

“The overseas countries and territories (OCT) are dependent territories that have a special relationship with one of the member states of the EU. Their status is described in the Treaty on the Functioning of the European Union, and they are not part of the EU”

https://en.wikipedia.org/wiki/Special_territories_of_members_of_the_European_Economic_Area?wprov=sfti1#French_overseas_territories