pass value fields as parameters to a shortcode

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Hi, I am using the Dynamic Contact Form 7 plugin to change the contents of a field by assigning shortcode. For that I have a hidden field called numsocio with this shorcode I have scheduled:

[dynamichidden numerosocio “CF7_ADD_NUMEROSOCIO nif=’nif’”]

I scheduled the shortcode is this:

function cf7_add_numero_socio($atts){
$a = shortcode_atts( array(
‘provincia’ => null
), $atts );
$nuevonumsocio = $a[‘nif’];
return $nuevonumsocio;
}
add_shortcode(‘CF7_ADD_NUMEROSOCIO’, ‘cf7_add_numero_socio’);

but does not receive the value of the form field. How do I have to send it or pick it up from the ShotCode to use as a parameter in the SQL query? Can you help?