Hello to all

I ask you for help to understand how to configure the electronic signature in TIA Portal Wincc Professional. in reality I don't understand why in an HMI project developed with wincc c/a it's possible to easily manage the electronic signature while with the professional it is not possible. for classic wincc (7.4, 7.5) there's that external application which, properly configured, allows the use of the signature but on the professional no.

who has already faced this problem could you give me suggestions to arrive at a solution? thank you very much