There’s a specific section on the forum where radio codes are supplied for a small donation. When you ask for code mention it’s not the original as not sure if they’re paired to the ECU of the car it came in. Think there’s ways round it, above my pay grade though!
Just looked and it’s in the I.C.E section. It’s called “The one and only code for Fiat radio thread” Try posting in there and i’m sure you’ll get some help