@StphaneGUERIN-4890 Welcome to Microsoft Q & A Community Forum. I understand that you are trying to enable cross region replication. Kindly note that certain regions are access restricted to support specific customer scenarios, such as in-country disaster recovery. France is one of them. These regions are available upon by request by creating support ticket from azure portal. For more information , refer this document.
You can restore vm to secondary region using cross region restore which is a paired region. For more information on how to restore, refer this document.