Hi @roberto colicci ,
Are you logged in with your Microsoft account to your computer? If this is the case you can follow the official link below on how to change your PIN:
https://support.microsoft.com/en-us/windows/change-your-pin-when-you-re-already-signed-in-to-your-device-0bd2ab85-b0df-c775-7aef-1324f2114b19
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Best regards,
Leon