Custom Validation dont´s work

I tried to create a custom validation following your documentation, but dont´s work.

What´s wrong?

add_action( 'user_registration_validate_number_crm','fcw_crm_validate_crm',10,4);
function fcw_crm_validate_crm($single_form_field, $data, $filter_hook, $form_id) {
	$field_label = isset( $data->label ) ? $data->label : '';
	$value = isset( $data->value ) ? $data->value : '';

	if (strlen($value) > 5) {
		return;
	}
	add_filter( $filter_hook, function ( $msg ) use ( $field_label ) {
		return __( $field_label . 'is too short.', 'user-registration' );
	});
}

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