Opinion of Advocate General Bobek delivered on 23 April 2020.#Pegaso Srl Servizi Fiduciari and Others v Poste Tutela SpA.#Request for a preliminary ruling from the Tribunale Amministrativo Regionale per il Lazio.#Reference for a preliminary ruling – Procurement in the water, energy, transport and postal services sectors – Directive 2014/25/EU – Article 13 – Activities relating to the provision of postal services – Contracting entities – Public undertakings – Admissibility.#Case C-521/18.