Traffic signs detection & navi sq3 sportback

Hello, I recently bought a used Audi Q3 Sportback (built in 2021). I live in Italy, and the car is a German import vehicle. So far it works perfectly, and I am very satisfied with it. However, I have a problem or am not clear: In the menu of the Virtual Cockpit there is the option “traffic sign identification”. However, this always shows the message “No traffic sign available”, no matter how big the signs are on the road. The car also has a camera-based traffic sign recognition. Does anyone have an idea? And another question: No traffic signs are displayed in the navigation system either. Are these not usually available in the navigation data, at least on the main roads? Thanks for your help and tips.