User update after form submit

Hi,

I try to update the user when he submits a form. But for some reason, it just won’t work with the action hook.
I tried my code standalone, and it works. But within the hook “wpcf7_before_send_mail”, the field will not be updated.

add_action( 'wpcf7_before_send_mail', array( $this, 'update_customer_after_form_submit') );

function update_customer_after_form_submit( $contact_data ){
	$id = $contact_data->id();
	if( $id === 55024 )	{
		// set customer meta
		$user_id = get_current_user_id();
		if( $user_id != 0 )	{
			update_user_meta( $user_id, 'b2b_company_registration', 1 );
		}
	}
}

Any help appreciated!
Best regards,
Christoph