Error '40934' when signing a procedure with a cryptographic card
Error '40934' is an identification error that generally occurs when you select an incorrect electronic certificate when signing a declaration.
Whether it is an electronic DNI or a certificate on a cryptographic card, it is necessary to ensure that you are selecting the authentication certificate for access and the signature certificate for signing and sending.
Also, check that you have entered the correct PIN, and whether the signature is protected with this password.
If you have several electronic certificates in your keystore and it is not possible to distinguish between them, you will need to test the certificates that appear in the list, restarting the browser so that you can choose the right certificate.