We solve.
Hi
Reading this Cannot install library with Arduino IDE 2.0.3 - #8 by ptillisch I discover the problem is a bug in versione 2.x of Arduino IDE about wrong management of proxy (and for this wrong uploading of root certificate)
To solve it we had to manually fix file C:\Users<username>.arduinoIDE\arduino-cli.yaml
Arduino IDE didn't show a configuration proxy setted before.
Bye
Bye