Article R424-3 of the French Code governing the entry and residence of foreign nationals and the right of asylum
When another Member State asks France whether a foreign national who already holds a residence permit bearing the words “long-term resident-EU” provided for in article L. 424-5 remains under the protection of the French Office for the Protection of Refugees and Stateless Persons, the reply is sent by the prefect who issued the permit, within a maximum period of one month following receipt of the application.