Judgment of the Court (Eighth Chamber) of 25 November 2021.#QY v Finanzamt Österreich.#Reference for a preliminary ruling – Articles 45 and 48 TFEU – Free movement of workers – Equal treatment – Family benefits provided to development aid workers who take their family members to the third country to which they have been posted – Withdrawal – Second paragraph of Article 288 TFEU – Legal acts of the Union – Application of regulations – National legislation the scope ratione personae of which is broader than that of a regulation – Conditions – Regulation (EC) No 883/2004 – Article 11(3)(a) and (e) – Scope – Employed person who is a national of one Member State, employed as development aid worker by an employer established in another Member State and posted to a third country – Article 68(3) – Right of an applicant for family benefits to lodge a single application with the institution of the Member State having primary competence or with the institution of the Member State having secondary competence.#Case C-372/20.