Order of the Court (Tenth Chamber) of 3 March 2021.#Koppány 2007 Kft. v Vas Megyei Kormányhivatal.#Reference for a preliminary ruling – Article 99 of the Rules of Procedure of the Court of Justice – Social security – Regulation (EU) No 1231/2010 – Applicable legislation – A1 certificate – Article 1 – Extension of A1 certificate to nationals of third countries residing legally in the territory of a Member State – Legal residence – Concept.#Case C-523/20.