CELEX:62021CJ0710: Judgment of the Court (Seventh Chamber) of 16 February 2023.#IEF Service GmbH v HB.#Request for a preliminary ruling from the Oberster Gerichtshof.#Reference for a preliminary ruling – Social policy – Protection of employees in the event of the insolvency of their employer – Directive 2008/94/EC – Article 9(1) – Undertaking that has its registered office in one Member State and offers its services in another Member State – Worker whose place of residence is in that other Member State – Work performed in the Member State in which the worker’s employer has its registered office and, one week out of two, in the Member State in which the worker resides – Determining which Member State’s guarantee institution is responsible for meeting outstanding wage claims.#Case C-710/21.