ItaliaRail Reservations: Only PNR? Experiences?

I am planning to travel with an Intercity Notte in a couple of weeks but the Interrail Reservation tool for some reason doesn’t show these trains for reservation (yet). Since those trains tend to sell out quickly around Ferragosto and ItaliaRail did offer them, I went ahead and reserved a couchette there – but the confirmation mail only submitts the PNR code and says I should simply show it to the conducter. I received no QR code or even a CP code to download it into the Trenitalia app.

Does anybody have experience with this?
Do they accept it easily?

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