Confirmed Agenzie delle Entrare emails
That me and my clients have used directly to apply for their Codice Fiscale online
Wait at least for few working days
(August is vacation period also here in Italy)
Full list of email you can try if they don’t respond or
ask you some extra documents you don’t have.
In the order of how fast they are (less busy). You should try them 1 by 1.
(your feedback is also very useful always so I can update the list / change order)
Full list: https://www1.agenziaentrate.gov.it/indirizzi/agenzia/uffici_locali/lista.htm?m=2&pr=MI