For Italian Authors: Question about Partita Iva and Ateco Code

Hello fellow Italians,
I am in “Regime Forfettario” and my Ateco code is 620100 (Produzione di software non connesso all’edizione).
I wanted to try to sell some plugins on Envato, but i am not sure if i can do that with my ATECO code. My tax advisor told me i can’t do this, because i need to subscribe to camera di commercio?

Thank you and best regards,