Judgment of the Court (First Chamber) of 10 March 2021.#M.A. v Konsul Rzeczypospolitej Polskiej w N.#Request for a preliminary ruling from the Naczelny Sąd Administracyjny.#Reference for a preliminary ruling – Border controls, asylum and immigration – Visa policy – Convention implementing the Schengen Agreement – Article 21(2a) – Charter of Fundamental Rights – Article 47 – Right to an effective remedy – Refusal of a long-stay visa by the consul – Obligation on a Member State to guarantee a remedy before a tribunal against a decision refusing such a visa.#Case C-949/19.