Opinion of Advocate General Richard de la Tour delivered on 20 January 2022.#European Commission v Republic of Austria.#Failure to fulfil obligations – Coordination of social security systems – Regulation (EC) No 883/2004 – Articles 4, 7 and 67 – Freedom of movement for workers – Regulation (EU) No 492/2011 – Article 7 – Equal treatment – Family benefits – Social and tax advantages – Adjustment of amounts on the basis of price levels in the children’s State of residence.#Case C-328/20.