Magento 2 – $.validator.methods[method] is undefined

On the create account page (/account/create) I am seeing this error: $.validator.methods[method] is undefined. Checking the page I cannot see what would be causing it. This is on magento enterprise if that makes a difference and this is running as a child theme from the parent.

Does anyone know what might be causing this please?

Company/account/create.phtml:

<form class="form create account form-create-account"
      action="<?= $block->escapeUrl($block->getPostActionUrl()) ?>"
      method="post" id="form-validate"
      enctype="multipart/form-data"
      autocomplete="off">
    <?= $block->getBlockHtml('formkey') ?>
    <fieldset class="fieldset info">
        <legend class="legend"><span><?= $block->escapeHtml(__('Company Information')) ?></span></legend><br>
        <div class="field company-name _required">
            <label class="label" for="company_name">
                <span><?= $block->escapeHtml(__('Company Name')) ?></span>
            </label>
            <div class="control">
                <input type="text" name="company[company_name]" id="company_name"
                       value=""
                       title="<?= $block->escapeHtmlAttr(__('Company Name')) ?>"
                       class="input-text" data-validate="{required:true}">
            </div>
        </div>

        etc...
    </fieldset>


    <div class="actions-toolbar">
        <div class="primary">
            <button type="submit" class="action save primary" title="<?= $block->escapeHtmlAttr(__('Submit')) ?>">
                <span><?= $block->escapeHtml(__('Submit')) ?></span>
            </button>
        </div>
    </div>

</form>
<?php $scriptString = <<<script

    require([
        'jquery',
        'mage/mage'
    ], function($) {

        var dataForm = $('#form-validate');
        var ignore = null;

        dataForm.mage('validation', {
            ignore: ignore ? ':hidden:not(' + ignore + ')' : ':hidden'
        }).find('input:text').attr('autocomplete', 'off');
    });
script;
?>
<?= /* @noEscape */ $secureRenderer->renderTag('script', [], $scriptString, false); ?>

<?php
/** @var DirectoryHelper $directoryDataHelper */
$directoryDataHelper = $block->getData('directoryDataHelper');
$countries = $directoryDataHelper->getCountriesWithOptionalZip(true) ?>
<script type="text/x-magento-init">
    {
        "#country_id": {
            "regionUpdater": {
                "optionalRegionAllowed": <?= $block->getConfig('general/region/display_all') ? 'true' : 'false' ?>,
                "regionListId": "#region_id",
                "regionInputId": "#region",
                "postcodeId": "#zip",
                "form": "#form-validate",
                "regionJson": <?= /* @noEscape */ $directoryDataHelper->getRegionJson() ?>,
                "defaultRegion": "",
                "countriesWithOptionalZip": <?= /* @noEscape */ $countries ?>
            }
        }
    }
</script>