#withKEY is an authentication system (mobile token) integrated into the Banca Intesa digital banking mobile app, allowing you to log in to desktop application and to authorize transactions.
You can access it on the login screen of mobile application by swiping the menu at the bottom of the mobile application screen and highlight #withKEY in the second row. Then enter your PIN for the mobile app or use the biometric method to create a one-time #withKEY password.
#withKEY also shows your user number.